Voir la notice de l'article provenant de la source Novi sad journal of mathematics website
@article{NSJOM_2002_32_1a_10, author = {V. Budimirovi\'c, B. \v{S}e\v{s}elja}, title = {Operators {H,} {S} and {P} in the classes of p-semigroups and p-semirings}, journal = {Novi Sad Journal of Mathematics}, pages = {127-132}, publisher = {mathdoc}, volume = {32}, number = {1}, year = {2002}, url = {http://geodesic.mathdoc.fr/item/NSJOM_2002_32_1a_10/} }
V. Budimirović, B. Šešelja. Operators H, S and P in the classes of p-semigroups and p-semirings. Novi Sad Journal of Mathematics, Tome 32 (2002) no. 1. http://geodesic.mathdoc.fr/item/NSJOM_2002_32_1a_10/