@article{BMMS_2011_34_2_a7,
     author = {Andrzej Walendziak},
     title = {On {Axiom} {Systems} of {Pseudo-BCK} {Algebras}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2011},
     volume = {34},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2011_34_2_a7/}
}