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'''International Conference on Intuitionistic Fuzzy Sets''' is a scientific meeting devoted to the [[intuitionistic fuzzy sets]], held in Sofia or Varna, Bulgaria annually since 1997 year. It is organized on the basis of a bilateral agreement for scientific cooperation between Institute of Biophysics and Biomedical Engineering at the Bulgarian Academy of Sciences and Systems Research Institute at the Polish Academy of Sciences.

The papers, presented at the conference, are published in the journal "[[Notes on Intuitionistic Fuzzy Sets]]". 

== Conference Proceedings ==
=== 1<sup>st</sup> ICIFS ===
First ICIFS was held on 18-19 October 1997 in Sofia. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/03/4|NIFS, Vol. 3, No. 4]].
{{:Notes on Intuitionistic Fuzzy Sets/03/4}}

=== 2<sup>nd</sup> ICIFS ===
Second ICIFS was held on 3-4 October 1998 in Sofia. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/04/2|NIFS, Vol. 4, No. 2]] and  [[Notes on Intuitionistic Fuzzy Sets/04/3|Vol. 4, No. 3]].
{{:Notes on Intuitionistic Fuzzy Sets/04/2}}
{{:Notes on Intuitionistic Fuzzy Sets/04/3}}

=== 3<sup>rd</sup> ICIFS ===
Third ICIFS was held on 16-17 October 1999 in Sofia. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/05/3|NIFS, Vol. 5, No. 3]].
{{:Notes on Intuitionistic Fuzzy Sets/05/3}}

=== 4<sup>th</sup> ICIFS ===
Fourth ICIFS was held on 16-17 September 2000 in Sofia. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/06/3|NIFS, Vol. 6, No. 3]] and [[Notes on Intuitionistic Fuzzy Sets/06/3|Vol. 6, No. 4]].
{{:Notes on Intuitionistic Fuzzy Sets/06/3}}
{{:Notes on Intuitionistic Fuzzy Sets/06/4}}

=== 5<sup>th</sup> ICIFS ===
Fifth ICIFS was held on 22-23 September 2001 in Sofia. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/07/3|NIFS, Vol. 7, No. 3]] and [[Notes on Intuitionistic Fuzzy Sets/07/3|Vol. 7, No. 4]].
{{:Notes on Intuitionistic Fuzzy Sets/07/3}}
{{:Notes on Intuitionistic Fuzzy Sets/07/4}}

=== 6<sup>th</sup> ICIFS ===
Sixth ICIFS was held on 13-14 September 2002 in Varna. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/08/3|Vol. 8, No. 3]].
{{:Notes on Intuitionistic Fuzzy Sets/08/3}}

=== 7<sup>th</sup> ICIFS ===
Seventh ICIFS was held on 23-24 August 2003 in Sofia. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/09/3|NIFS, Vol. 9, No. 3]] and [[Notes on Intuitionistic Fuzzy Sets/09/3|Vol. 9, No. 4]].
{{:Notes on Intuitionistic Fuzzy Sets/09/3}}
{{:Notes on Intuitionistic Fuzzy Sets/09/4}}

=== 8<sup>th</sup> ICIFS ===
Eighth ICIFS was held on 20-21 June 2004 in Varna. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/10/3|NIFS, Vol. 10, No. 3]] and [[Notes on Intuitionistic Fuzzy Sets/10/4|Vol. 10, No. 4]].
{{:Notes on Intuitionistic Fuzzy Sets/10/3}}
{{:Notes on Intuitionistic Fuzzy Sets/10/4}}

=== 9<sup>th</sup> ICIFS ===
Ninth ICIFS was held on 7-8 May 2005 in Sofia. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/11/2|NIFS, Vol. 11, No. 2]], [[Notes on Intuitionistic Fuzzy Sets/11/3|Vol. 11, No. 3]], and [[Notes on Intuitionistic Fuzzy Sets/11/4|Vol. 11, No. 4]].
{{:Notes on Intuitionistic Fuzzy Sets/11/2}}
{{:Notes on Intuitionistic Fuzzy Sets/11/3}}
{{:Notes on Intuitionistic Fuzzy Sets/11/4}}

=== 10<sup>th</sup> ICIFS ===
Tenth ICIFS was held on 28-29 October 2006 in Sofia. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/12/3|NIFS, Vol. 12, No. 3]].
{{:Notes on Intuitionistic Fuzzy Sets/12/3}}

=== 11<sup>th</sup> ICIFS ===
Eleventh ICIFS was held on 28-30 April 2007 in Sofia. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/12/3|NIFS, Vol. 13, No. 2]].
{{:Notes on Intuitionistic Fuzzy Sets/13/2}}

=== 12<sup>th</sup> ICIFS ===
Twelfth ICIFS was held on 17-18 May 2008 in Sofia. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/14/1|NIFS, Vol. 14, No. 1]] and [[Notes on Intuitionistic Fuzzy Sets/14/2|Vol. 14, No. 2]].
{{:Notes on Intuitionistic Fuzzy Sets/14/1}}
{{:Notes on Intuitionistic Fuzzy Sets/14/2}}

=== 13<sup>th</sup> ICIFS ===
Thirteenth ICIFS was held on 9-10 May 2009 in Sofia. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/15/1|NIFS, Vol. 15, No. 1]] and [[Notes on Intuitionistic Fuzzy Sets/15/2|Vol. 15, No. 2]].
{{:Notes on Intuitionistic Fuzzy Sets/15/1}}
{{:Notes on Intuitionistic Fuzzy Sets/15/2}}

=== 14<sup>th</sup> ICIFS ===
The Fourteenth ICIFS was held on 15-16 May 2010 in Sofia. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/16/2|Notes on Intuitionistic Fuzzy Sets, Vol. 16, No. 2]]. 
{{:Notes on Intuitionistic Fuzzy Sets/16/2}}

=== 15<sup>th</sup> ICIFS ===
The Fifteenth ICIFS was held on 11-12 May 2011 in Burgas. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/17/2|Notes on Intuitionistic Fuzzy Sets, Vol. 17, No. 2]]. 
{{:Notes on Intuitionistic Fuzzy Sets/17/2}}

=== 16<sup>th</sup> ICIFS ===
The Sixteenth ICIFS was held on 9–10 September 2012 in Sofia. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/18/3|Notes on Intuitionistic Fuzzy Sets, Vol. 18, No. 3]]. 
{{:Notes on Intuitionistic Fuzzy Sets/18/3}}

=== 17<sup>th</sup> ICIFS ===
The Seventeenth ICIFS was held on 1-2 November 2013 in Sofia. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/19/3|Notes on Intuitionistic Fuzzy Sets, Vol. 19, No. 3]]. 
{{:Notes on Intuitionistic Fuzzy Sets/19/3}}

=== 18<sup>th</sup> ICIFS ===
The Eighteenth ICIFS was held on 10-11 May 2014 in Sofia. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/20/2|Notes on Intuitionistic Fuzzy Sets, Vol. 20, No. 2]]. 
{{:Notes on Intuitionistic Fuzzy Sets/20/2}}

=== 19<sup>th</sup> ICIFS ===
The Nineteenth ICIFS was held on 4-6 June 2015 in Burgas. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/21/2|Notes on Intuitionistic Fuzzy Sets, Vol. 21, No. 2]]. 
{{:Notes on Intuitionistic Fuzzy Sets/21/2}}

=== 20<sup>th</sup> ICIFS ===
The Twentieth ICIFS was held on 2-3 September 2016 in Sofia. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/22/3|Notes on Intuitionistic Fuzzy Sets, Vol. 22, No. 3]].
{{:Notes on Intuitionistic Fuzzy Sets/22/3}}

=== 21<sup>st</sup> ICIFS ===
The 21<sup>st</sup> ICIFS  was held on 22-23 May 2017 in Burgas. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/23/2|Notes on Intuitionistic Fuzzy Sets, Vol. 23, No. 2]].
{{:Notes on Intuitionistic Fuzzy Sets/23/2}}

=== 22<sup>nd</sup> ICIFS ===
The 22<sup>nd</sup> ICIFS was held on 12-13 May 2018 in Sofia. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/24/2|Notes on Intuitionistic Fuzzy Sets, Vol. 24, No. 2]]. 
=== 23<sup>rd</sup> ICIFS ===
The 23<sup>rd</sup> ICIFS was held on 16-17 May 2019 in Sofia. The conference proceedings are published in [[Notes on Intuitionistic Fuzzy Sets/25/2|Notes on Intuitionistic Fuzzy Sets, Vol. 25, No. 2]]. 

{{:Notes on Intuitionistic Fuzzy Sets/25/2}}

== See also ==
* [[:Category:ICIFS conference publications|ICIFS conference publications]]
* [[International Workshop on Intuitionistic Fuzzy Sets]]
* [[International Workshop on Intuitionistic Fuzzy Sets and Generalized Nets]]

[[Category:Conferences]]
[[Category:Intuitionistic fuzzy sets]]