INEQUALITIES FOR VALUES OF DIFFERENTIAL-OPERATORS ON ALGEBRAIC POLYNOMIALS ON A SPHERE Article ZHIDKOV G.V. Differential Equations. Vol. 17. 1981. P. 329-336
THE STABILIZATION AND LIMITING AMPLITUDE OF THE CAUCHY-PROBLEM SOLUTION FOR INHOMOGENEOUS SOBOLEV SYSTEMS Article MASLENNIKOVA V.N., PAL P.K. Doklady Akademii nauk SSSR. Mezhdunarodnaya Kniga, Moscow, Russian Federation. Vol. 259. 1981. P. 1297-1302