共 7 条
[2]
Gol'dshtein VM., 1983, INTRO THEORY FUNCTIO, P285
[5]
Littman W., 1963, Ann. Sc. Super. Norm. Pisa Cl. Sci., V17, P43
[6]
Mazya V.G., 1985, Theory of Multipliers in Spaces of Differentiable Functions
[7]
Oleinik O.A., 1973, Second Order Equations with Nonnegative Characteristic