Media type: E-Article Title: Antonio J. Conejo : Universidad de Castilla — La Mancha, España : Universidad de Castilla — La Mancha, España Published: Springer Science and Business Media LLC, 2003 Published in: Top, 11 (2003) 2, Seite 200-203 Language: English DOI: 10.1007/bf02579037 ISSN: 1863-8279; 1134-5764 Keywords: Discrete Mathematics and Combinatorics ; Statistics and Probability ; Management Science and Operations Research ; Information Systems and Management ; Modeling and Simulation Origination: Footnote: