Issue No. 01 - January/February (1986 vol. 3)
H.F. Korth , University of Texas at Austin
The relational model can serve as the foundation for an extended language that incorporates features of several languages, including functional and object-oriented languages, and allows alternative forms of expression.
H.F. Korth, "Extending the Scope of Relational Languages", IEEE Software, vol. 3, no. , pp. 19-28, January/February 1986, doi:10.1109/MS.1986.232429