Krichevskij, I. E.; Levin, M. I.; Polterovich, V. M.; Shchepina, I. N. A model of multicomponent substitution. (Russian) Zbl 0709.90646 Ehkon. Mat. Metody 26, No. 2, 291-301 (1990). MSC: 90-XX Operations research, mathematical programming PDF BibTeX XML Cite \textit{I. E. Krichevskij} et al., Mat. Metody Resheniya Èkon. Zadach 26, No. 2, 291--301 (1990; Zbl 0709.90646)