On Monoids in the Category of Sets and Relations
Jenčová Anna  Jenča Gejza ; 010220
International Journal of Theoretical Physics . Vol. 56, No. 12 (2017), s. 3757-3769
effect algebra relational monoid 2-category
https://link.springer.com/article/10.1007%2Fs10773-017-3304-z
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