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García-Ferrero, Gómez-Ullate : Oscillation theorems for the Wronskian of an arbitrary sequence of eigenfunction... http://t.co/rQvUvpPLjc
García-Ferrero, Gómez-Ullate : Oscillation theorems for the Wronskian of an arbitrary sequence of eigenfunction... http://t.co/rQvUvpPLjc