On-line sales recording system. - J. S. Baer; A. S. Rettig; I. Cohen (IRE-ACM-AIEE Computer Conference (Eastern), 1957)

RCA's automatic store and forward message switching system. - T. L. Genetta; H. P. Guerber; A. S. Rettig (IRE-AIEE-ACM Computer Conference (Western), 1960)