- NP-Completeness for Algebra and Number Theory, Games and Puzzles, Logic and Open Problems by Daljit S. Jandu,  2007-07-15
 - Some fundamental problems in the manufacture of steel by the acid open hearth and acid electric processes (Bulletin / Acid Open Hearth Research Association) by G. R Fitterer,  1945
 - Research on open education, problems and issues by Lilian Katz,  1972
 - Discrete computation: Theory and open problems; notes for the lectures (Project MAC) by Albert R Meyer,  1974
 - Buell's diagrams;: For the graphic solution of quantitative heat transmission problems relating to open-hearth and other high-temperature furnaces by William C Buell,  1937
 - Formal Language Theory: Perspectives and Open Problems by Editor-Ronald V. Book,  1981
 - Progressive wave expansions and open boundary problems (NASA contractor report) by Thomas Hagstrom,  1995
 - A solution to an open problem due to Stearns and Hunt (Technical report. State University of New York at Albany. Dept. of Computer Science) by S. S Ravi,  1986
 - Fair division under joint ownership: Recent results and open problems (Discussion papers) by HerveÌ Moulin,  1989
 - Polymer Physics: Concepts Methods and Open Problems (World Scientific Lecture Notes in Physics) by M. Muthukumar,  2004-11
 - Thirty open problems concerning torsion theories by Jonathan S Golan,  1986
 - Positivity in Lie Theory Open Problems by Joachim Hilgert,  1980
 - Algebraic geometry: Open problems: proceedings of the conference held in Ravello, May 31-June 5, 1982 
 - Preliminary report on tests of the application of geophysical methods to arctic ground-water problems (Open-file report - United States Geological Survey) by David F Barnes,  1964
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