Paul Penfield Jr.. Complex APL: comments from the APL community. ACM SIGAPL APL Quote Quad, 9(1):6-10, 1978. [doi]
@article{Penfield78, title = {Complex APL: comments from the APL community}, author = {Paul Penfield Jr.}, year = {1978}, doi = {10.1145/586040.586042}, url = {https://doi.org/10.1145/586040.586042}, researchr = {https://researchr.org/publication/Penfield78}, cites = {0}, citedby = {0}, journal = {ACM SIGAPL APL Quote Quad}, volume = {9}, number = {1}, pages = {6-10}, }