 Peckam and Maryanski (1988) wrote about RM/T in their study of semantic data models.Codd published his book in 1990 but wrote nothing more about RM/T.RM/V1 and RM/V2 have a chapter each in "Date and Darwen" (1992) and the Date (1983) article was updated in (1995) and now contains a long overdue comparison of the E/R model and RM/T.