BURYACHENKO, K. O. SOLVABILITY OF THE NEUMANN PROBLEM FOR SOME CLASSES OF IMPROPERLY ELLIPTIC FOURTH ORDER EQUATIONS. Cherkasy University Bulletin: Physical and Mathematical Sciences, [S. l.], v. 349, n. 16, 2016. Disponível em: https://phys-ejournal.cdu.edu.ua/article/view/446. Acesso em: 17 may. 2026.