PageHeader : Funkcialaj Ekvacioj, 28 (1985), 47-55 Title : Oscillation Theory for Second Order Differential Systems Title : with Functionally Commutative Matrix Coefficients AuthorInfo : By AuthorInfo : G.J. BUTLER* and L.H. ERBE* AuthorInfo : (University of Alberta, Canada) section : 1. section : 2. section : 3. section : References