For the source, page 16: https://dl.acm.org/action/showFmPdf?doi=10.1145%2F1012443 [pdf]. If that direct link doesn't work, https://dl.acm.org/toc/sigsoft/1985/10/1 and select the "Front matter" PDF.

https://dl.acm.org/doi/10.1145/1012621.1012623 - A continuation in the next issue of SEN.