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On the asymptotic behaviour of the solutions of -(r(t)u ')' + p(t)u=0, where p is not of constant sign

Bibliographic reference Duhoux, Michel. On the asymptotic behaviour of the solutions of -(r(t)u ')' + p(t)u=0, where p is not of constant sign. In: Belgian Mathematical Society - Simon Stevin. Bulletin, Vol. 9, no. 1, p. 1-14 (2002)
Permanent URL http://hdl.handle.net/2078.1/41894