Correction: 31 
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I have the feeling (supported by personal experience) that these "special issues" are infested with concerns such as strong connivence between authors and guest editors...
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The supposed Guest Editor is one Grajkowsk Wisława of Wroclaw University of Science & Technology, who *doesn't exist*. The provided e-address is grajkowskaw@ust.edu.pl, which doesn't even belong to Wroclaw UST, but rather to a conference-organiser company. https://pubpeer.com/publications/B31B4E5F0B5B6FA351FB5F95129D95#1 …
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This is their second batch of mass retractions recently. The other one was from Journal of Intelligent & Fuzzy Systems when they retracted 48 papers all at once. All from China.
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