@article{IVM_1966_5_a16,
     author = {O. V. Shimel'fenig},
     title = {Extension of generalized heaps},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {129--141},
     publisher = {mathdoc},
     number = {5},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1966_5_a16/}
}