Algebraic methods in the theory of global properties of the oscillatory equations $y''=q(t)y$
Article:
Borůvka, Otakar
Algebraic methods in the theory of global properties of the oscillatory equations $Y''=Q(t)Y$(English).Equadiff IV - Proceedings, Prague 1977, Lecture Notes in Mathematics 703, Springer, 1979, 35-45 (more ...)