@article{DE_1985_21_1_a27,
     author = {E. P. Eroshenkov},
     title = {Letter to the editors: {{\textquotedblleft}The} spectrum of the {Bitsadze{\textendash}Samarskiǐ} problem{\textquotedblright} {[Differentsial'nye} {Uravneniya} 19 (1983), no.~1,},
     journal = {Differencialʹnye uravneni\^a},
     pages = {178},
     year = {1985},
     volume = {21},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_1_a27/}
}