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Haurie, A. B., Polis, M. P., & Yansouni, P. A. (1973). On the optimal control on an infinite planning horizon of consumption, pollution and natural resource use. (Rapport technique n° EP-R-73-15). Accès restreint
O'Shea, J., & Polis, M. P. (1973). The synthesis of an urban transportation system based on societal criteria. (Rapport technique n° EP-R-73-16). Disponible