James, Robinson B.  “Is Whitehead's "Actual Entity" a Contradiction in Terms?”  Process Studies 2, no. 2 (Sum 1972): 112-125.

Abstract

Using numerous primary texts, the paper argues that Whitehead's "actual entities", in which all existence is vested, are fluent spurts of becoming.  Only with their unextended terminal instants do they become definite, and thus "entities" in his proper sense.  But therewith they lose their "actualness", in his ontologically basic (though scarcely recognized) sense.  This near-contradiction in terms shows, against W. Christian and J. Cobb but with I. Leclerc, how very fluent Whiteheadian reality is.  [Abstract from The Philosopher’s Index]