Book Review: "Introduction à APL". - Joseph de Kerf (ACM SIGAPL APL Quote Quad, 1979)

APL and Halstead's theory of software metrics. - Joseph de Kerf (APL, 1981)

APL compared with other languages according to Halstead's theory. - Joseph de Kerf (ACM SIGPLAN Notices, 1986)

A note on the Power Operators "loops are harmful". - Joseph de Kerf (ACM SIGPLAN Notices, 1989)

The implementation of set functions in APL: a proposal. - Joseph de Kerf (ACM SIGAPL APL Quote Quad, 1998)

APL Extended Compared With Other Languages According to Halstead's Theory. - F. H. D. van Batenburg; Ellen de Ridder; Joseph de Kerf (ACM SIGPLAN Notices, 1998)