Perturbations of discontinuous solutions of non-Linear systems of differential equations
1947 ◽
Vol 33
(7)
◽
pp. 214-218
◽
1982 ◽
Vol 13
(2)
◽
pp. 23-34
◽
1972 ◽
Vol 25
(3)
◽
pp. 241-247
◽