@article{MT_2011_14_2_a6,
     author = {V. N. Potapov},
     title = {On extensions of partial $n$-quasigroups of order~4},
     journal = {Matemati\v{c}eskie trudy},
     pages = {147--172},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_2011_14_2_a6/}
}