Optimal exploitation of a renewable resource with stochastic nonconvex technology : an analysis of extinction and survival / T. Mitra and S. RoyOptimal exploitation of a renewable resource with stochastic nonconvex technology : an analysis of extinction and survival / Tapan Mitra, Santanu RoyOptimal exploitation of a renewable resource with stochastic nonconvex technology : an analysis of extinction and survival / Tapan Mitra, Santanu Roy