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.

	1	I. Nassi , B. Shneiderman, Flowchart techniques for structured programming, ACM SIGPLAN Notices, v.8 n.8, p.12-26, August 1973  [doi>10.1145/953349.953350]
	2	Phil Grouse, "Flowblocks": a technique for structured programming, ACM SIGPLAN Notices, v.13 n.2, p.46-56, February 1978  [doi>10.1145/953422.953424]
	3	Patrick Roy , Richard St-Denis, Linear flowchart generator for a structured language, ACM SIGPLAN Notices, v.11 n.11, November 1976  [doi>10.1145/987335.987342]
	4	B. W. Kernighan , D. M. Ritchie, The C programming language, Prentice-Hall, Inc., Upper Saddle River, NJ, 1978
	5	James F. Gimpel, Blocks—a new datatype for SNOBOL4, Communications of the ACM, v.15 n.6, p.438-447, June 1972  [doi>10.1145/361405.361410]
	6	Ralph E Griswold, The SNOBOL 4 programming language, Prentice-Hall, Inc., Upper Saddle River, NJ, 1971