@article{10_14708_cm_v51i1_5312,
     author = {Grzegorz Dymek},
     title = {Normal {pseudo-BCK-algebras}},
     journal = {Commentationes Mathematicae},
     pages = { 99--107},
     publisher = {mathdoc},
     volume = {51},
     number = {1},
     year = {2011},
     doi = {10.14708/cm.v51i1.5312},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v51i1.5312/}
}