%0 Journal Article %A V. Lakshmikantham %A A. Richard Mitchell %A Roger W. Mitchell %T Maximal and minimal solutions and comparison results for differential equations in abstract cones %J Annales Polonici Mathematici %D 1977 %P 317-324 %V 34 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-34-3-317-324/ %R 10.4064/ap-34-3-317-324 %G en %F 10_4064_ap_34_3_317_324