Basic Operations on Information as a Basis for Data Base Design. - Paul Lindgreen (IFIP Congress, 1974)

SODA - A Flexible Scheme for Database/ Program Interface. - Paul Lindgreen; Edith Rosenberg (International Computing Symposium, 1977)

Entity Sets and their Description. - Paul Lindgreen (ER, 1983)

Entities from a Systems Point of View. - Paul Lindgreen (ER, 1986)

The Concepts Behind A Systemateque. - Paul Lindgreen (CA(i)SE, 1989)

A General Framework for Understanding Semantic Structures: On Making Explicit the Tacit Knowledge of an Area. - Paul Lindgreen (ISCO, 1992)

Anything, everything and things playing roles: Three realizing principles as a contribution to a platform for understanding. - Paul Lindgreen (ISCO, 1995)

A Framework of Information System Concepts (The FRISCO Report). - Eckhard D. Falkenberg; Wolfgang Hesse; Paul Lindgreen; Björn E. Nilsson; J. L. Han Oei; Colette Rolland; Ronald K. Stamper; Frans Van Assche; Alexander A. Verrijn-Stuart; Klaus Voss (IFIP, 1998)

SCIP: A Scandinavian Project on Systems Analysis and Design. - Paul Lindgreen (History of Nordic Computing, 2003)