Grigorieva, E.V., Khailov, E.N. and Kharitonova, E.I. 2011. Optimal control of pollution stock through ecological interaction of the manufacturer and the state. Revista de Matemática: Teoría y Aplicaciones. 18, 1 (Feb. 2011), 11–110. DOI:https://doi.org/10.15517/rmta.v18i1.2116.