@article{DMGAA_2013_33_2_a3,
     author = {Harizavi, Habib and Koochakpoor, Tayebeh and Boorzoei, Rajab},
     title = {Quotient hyper pseudo {BCK-algebras}},
     journal = {Discussiones Mathematicae. General Algebra and Applications},
     pages = {147--165},
     publisher = {mathdoc},
     volume = {33},
     number = {2},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGAA_2013_33_2_a3/}
}