1. Some remarks on nonlocal elliptic and parabolic problems;Chipot;Nonlinear Anal.,1997
2. Mechanik;Kirchhoff,1883
3. Sur une classe dʼéquations fonctinnelles aux dérivées partielles;Bernstein;Bull. Acad. Sci. URSS Sér. [Izv. Akad. Nauk SSSR],1940
4. A certain class of quasilinear hyperbolic equations;Pohožaev;Mat. Sb. (N.S.),1975
5. On some questions in boundary value problems of mathematical physics;Lions,1978