- A 65-approximation algorithm for the two-machine routing open-shop problem on a two-node network [An article from: European Journal of Operational Research] by I. Averbakh, O. Berman, et all 
 - A method for solving the minimization of the maximum number of open stacks problem within a cutting process [An article from: Computers and Operations Research] by J.C. Becceneri, H.H. Yanasse, et all  2004-12-01
 - Training Problems in Open Shop Construction: A Construction Industry Cost Effectiveness Project Report 
 - The routing open-shop problem on a network: Complexity and approximation [An article from: European Journal of Operational Research] by I. Averbakh, O. Berman, et all  2006-09-01
 - On the open-shop problem with preemption and minimizing the average completion time [An article from: European Journal of Operational Research] by H. Brasel, H. Hennes,  2004-09-16
 - THE PROBLEM OF WEALTH - AN OPEN LETTER TO ANDREW CARNEGIE - AND OTHER ESSAYS by MAX HIRSCH,  1911-01-01
 - The effect of instruction with computer simulation as a research tool on open-ended problem-solving in a Spanish classroom of 16-year-olds.: An article ... in Mathematics and Science Teaching by Jose Luis Sierra-Fernandez, F. Javier Perales-Palacios,  2003-06-22
 - The problem of wealth: An open letter to Andrew Carnegie and other essays by Max Hirsch,  1911
 - Open Problems in Topology by Jan Van Mill,  1990-07
 - Unfolding the Labyrinth: Open Problems in Physics, Mathematics, Astrophysics and other Areas of Science by Florentin Smarandache; V. Christianto; Fu Yuhua; R. Khrapko; J. Hutchison,  2006-09-27
 - Argentina under the Depression: Problems of an open economy (Documento de trabajo / Instituto Torcuato Di Tella, Centro de Investigaciones Sociales) by Arturo O'Connell,  1983
 - Twelve Problems in Biology: Open-Ended Experiments for Introductory College Biology by Jonathan C. Hake,  1971-01
 - New directions and open problems in iteration theory (Berichte der Mathematisch-Statistischen Sektion im Forschungszentrum Graz) by György I Targonski,  1984
 - Some open problems in the theory of program schemes and dynamic logics (BUCS tech report) by A. J Kfoury,  1988
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