TY - JOUR T1 - The chemistry of control structures JF - ACM SIGPLAN Notices Y1 - 1974 A1 - Shneiderman, Ben VL - 9 SN - 0362-1340 UR - http://doi.acm.org/10.1145/953246.953249 CP - 12 M3 - 10.1145/953246.953249 ER -