On superprojectors
Loide, Rein-Karl
Physics Letters, B
1984
/
p. 61-63
https://doi.org/10.1016/0370-2693(84)90559-8
https://www.ester.ee/record=b1199033*est
https://www.sciencedirect.com/science/article/abs/pii/0370269384905598