@article{IVM_1972_11_a13,
     author = {T. N. \`Eingorina and M. Ya. \`Eingorin},
     title = {The existence of incomplete balanced block schemes with variable block volume},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {98--109},
     year = {1972},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1972_11_a13/}
}