Another note on closed N -cells in 𝐑 N Rae W. J. Mitchell — 1982 Commentationes Mathematicae Universitatis Carolinae
On the existence of solutions of differential equations of retarded type in a Banach space V. Lakshmikantham; A. R. Mitchell; R. W. Mitchell — 1978 Annales Polonici Mathematici
Maximal and minimal solutions and comparison results for differential equations in abstract cones V. Lakshmikantham; A. Richard Mitchell; Roger W. Mitchell — 1977 Annales Polonici Mathematici