1. A formal definition of a PL/1 subset;Bekic,1974
2. A denotational semantics for shared-memory parallelism and nondeterminism;Berry;Acta Informatica,1985
3. On the partial computation principle;Ershov;Information Processing Letters,1977
4. On the essence of compilation;Ershov,1977
5. An implementation-oriented method for describing algorithmic languages;Ershov,1977