Frege and Peirce on the signs of generalityPietarinen, Ahti-Veikko; Bellucci, Francesco6th World Congress and School on Universal Logic, UNILOG'2018, June 16–26, 20182018 / p. 266-268 : illhttp://www.uni-log.org/pro2018/HANDBOOK-UNILOG2018.pdf
Logical consequence in the diagrammatic system of assertive graphs [Online resource]Chiffi, Daniele; Pietarinen, Ahti-VeikkoHandbook of the 6th World Congress and School on Universal Logic2018 / p. 262-263http://www.uni-log.org/pro2018/HANDBOOK-UNILOG2018.pdf