TY - JOUR AU - V. A. Koldorkina TI - The solutions of the equation $\Delta \Delta u=f$ in a piecewise smooth domain JO - Differencialʹnye uravneniâ PY - 1972 SP - 374 EP - 376 VL - 8 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1972_8_2_a18/ LA - ru ID - DE_1972_8_2_a18 ER -