Transformations of structures: An algebraic approach

A relational model of data for large shared data banks

E. F. Codd · Communications of the ACM · 1970 · 5.2K citations · Full text

Computing, Computer Science, Information Systems +16

A relational model of data for large shared data banks

E. F. Codd · Communications of the ACM · 1983 · 4.8K citations

Computing, Computer Science, Information Systems +16

Graph-grammars: An algebraic approach

Hartmut Ehrig, Michael Pfender · 1973 · 488 citations

Computing, Computer Science, Mathematics +15

Heterogeneous algebras

Garrett Birkhoff, John D. Lipson · Journal of Combinatorial Theory · 1970 · 233 citations

Computing in systems described by equations

Computer-Aided Design · 1978 · 216 citations · Full text

Natural Sciences, Computer Science, Mathematics +8