ELMA as an instrumental system for building practical programming systemsLepp, Marge; Vooglaid, Aare; Võhandu, LeoData processing, compiler writing, programming1986 / p. 85-91 : ill https://www.ester.ee/record=b1275336*est https://digikogu.taltech.ee/et/Item/2f07e0bc-df93-4429-80b8-c48c8a98986b