FQL - A Functional Query Language. - Peter Buneman; Robert E. Frankel (SIGMOD Conference, 1979)

A practical functional programming system for databases. - Peter Buneman; Rishiyur S. Nikhil; Robert E. Frankel (FPCA, 1981)

An Implementation Technique for Database Query Languages. - Peter Buneman; Robert E. Frankel; Rishiyur S. Nikhil (ACM Trans. Database Syst., 1982)