- Geplante Aussenräume : Wahrnehmung u. Gestaltung von Aussenräumen : e. Beitrag zum Problem d. städtebaulichen Entwurfs am Beispiel von Berliner Wohngebieten by Dittmar Machule,
- Problem Solving: Current Issues (Open Guides to Psychology) by Hank Kahney, April, 1993
- Argentina under the Depression : problems of an open economy by Arturo O'Connell,
- International transfer of new technologies and problems of adjustment in small open economies : proceedings of the Third Canadian-Hungarian Economic Roundtable, April 28-30, 1982, Budapest
- The Open Research Problems in the Life Sciences Under Tropical Conditions: Proceedings by D. Hall, M. Lamottee, et all August, 1987
- Twelve Problems in Biology: Open-Ended Experiments for Introductory College Biology by Jonathan C. Hake, January, 1971
- Algebraic Geometry--Open Problems by C. Ciliberto, July, 1983
- Open Problems in Communication and Computation by B. Gopinath, T. M. Cover, December, 1987
- Simple Models of Equilibrium and Nonequilibrium Phenomena (Studies in Statistical Mechanics, Vol 13) by J.L. Lebowitz, October, 1987
- Development Problems of an Open-Access Resource: The Fisheries of Peninsular Malaysia by Ooi Jin Bee, July, 1990
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