@article{MZM_1994_56_1_a0,
author = {A. P. Gurevich and A. P. Khromov},
title = {First and second order differentiation operators with weight functions of variable sign},
journal = {Matemati\v{c}eskie zametki},
pages = {3--15},
year = {1994},
volume = {56},
number = {1},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/MZM_1994_56_1_a0/}
}
A. P. Gurevich; A. P. Khromov. First and second order differentiation operators with weight functions of variable sign. Matematičeskie zametki, Tome 56 (1994) no. 1, pp. 3-15. http://geodesic.mathdoc.fr/item/MZM_1994_56_1_a0/
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