On the Discrete Analogues of Some Genralizations of Gronwall's Inequality. J.S.W. Wong; D. Willett — 1965 Monatshefte für Mathematik
Some Properties of Solutions of u''(t) + a(t) f(u) g(u') = 0 (II). J.S.W. Wong; T.A. Burton — 1965 Monatshefte für Mathematik