1. On second-order non-linear oscillation;Atkinson;Pacific J. Math.,1955
2. A matrix analogue of Atkinson's oscillation theorem;Kura;Funkcial Ekval.,1982
3. Oscillation theorems for second order differential systems with functionally commutative matrix coefficients;Butler;Funkcial Ekval.,1985
4. Oscillation of superlinear matrix differential equation;Ahlbrandt;Proc. Amer. Math. Soc.,1989
5. Volterra–Stieltjes integral equations and generalized ordinary differential expressions;Mingarelli,1983