@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/}
}