Algebraic elements in the transformation theory of 2nd order linear oscillatory differential equations http://hdl.handle.net/10338.dmlcz/500132 67 Algebraic elements in the transformation theory of 2nd order linear oscillatory differential equations http://hdl.handle.net/10338.dmlcz/500131 Algebraic elements in the transformation theory of 2nd order linear oscillatory differential equations Tue, 14 Jun 2011 13:21:54 GMT