@article{IVM_1965_5_a4,
     author = {V. V. Vagner},
     title = {On the theory of heapoids},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {31--42},
     publisher = {mathdoc},
     number = {5},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1965_5_a4/}
}