@article{DE_1993_29_4_a10,
     author = {R. P. Tarasov},
     title = {A quadratic root of a selfadjoint operator, and the {Cauchy} problem for elliptic-type equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {662--672},
     publisher = {mathdoc},
     volume = {29},
     number = {4},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1993_29_4_a10/}
}