[1] J. Kadlec R. Výborný:
Strong maximum principle for weakly nonlinear parabolic equations. CMUC 6, 1 (1965), 19-20.
MR 0177203
[2] E. De Giorgi: Sulla differenziabilitá e ľanalitici delle estremali degli integrali multipli regolari. Mem. Acad. Sci. Torino, S. III, Parte I, (1957), 25-43.
[3] L. Nirenberg:
A strong maximum principle for parabolic equations. Comm. Pure and Appl. Math. 6 (1953), 167-177.
MR 0055544 |
Zbl 0050.09601
[4] G. Stampacchia:
Le probléme de Dirichlet pour les équations elliptiques du second ordre a coeffìcients discontinus. Annales ľinst. Fourier, XV, 1, (1965), 189-259.
MR 0192177 |
Zbl 0151.15401
[5] C. B. Morrey:
Second order elliptic equations in several variables and Hölder continuity. Math. Zeitschr. 72 (1959), 146-164.
MR 0120446 |
Zbl 0094.07802
[6] O. A. Лaдыжeнcкaя H. H. Уpaльцeвa: O нeпpepывнocти пo Гeльдepy peшeний и иx пpoизвoдныx для линeйныx и квacилинeйныx ypaвнeний эллиптичrecкoгo и пapaбoличecкoгo типoв. Tpyды ин. B. A. Стeклoвa LXXIII, Mocквa 1964, 172-220.