Teichroew, Daniel "An approach to research in file organization" Proceedings of the 1971 Annual ACM Conference on Research and Development in Information Retrieval, College Park, Maryland pp147 - 154
(1971)
Languages mentioned
Information Algebra
{1962} formalism for data processing
PSL
{1970} Problem Statement Language
SYSTEMATICS
{1972} Decision table based systems language
Young and Kent
{1958} Non-procedural language for formalising DP problems