INEQUALITIES FOR VALUES OF DIFFERENTIAL-OPERATORS ON ALGEBRAIC POLYNOMIALS ON A SPHERE СтатьяZHIDKOV G.V.Differential Equations. Том 17. 1981. С. 329-336
THE STABILIZATION AND LIMITING AMPLITUDE OF THE CAUCHY-PROBLEM SOLUTION FOR INHOMOGENEOUS SOBOLEV SYSTEMS СтатьяMASLENNIKOVA V.N., PAL P.K.Doklady Akademii nauk SSSR. Том 259. 1981. С. 1297-1302