Note: OCR errors may be found in this Reference List extracted from the full text article. ACM has opted to expose the complete List rather than only correct and linked references.
{Ledgard 1977} Henry F. Ledgard Production System: A Notation for Defining Syntax and Translation IEEE TRANSACTIONS ON SOFTWARE ENGINEERING, March 1977
3
{Ledgard and Marcotty 1980} Henry Ledgard and Michael Marcotty Concepts in Programming Languages: Features in a Landscape in preparation
4
{PL/I 1975} ECMA-ANSI PL/I Language Standard Basis 1--12 Computer and Business Equipment Manufacturer's Association Washington, D.C., February 1975