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1.	Gyllenberg, Mats, et al. (author) Null recurrence in a stochastic Ricker model 1994 In: Analysis, algebra, and computers in mathematical research. - New York : Marcel Dekker Incorporated. - 0824792173 ; , s. 147-164 Conference paper (peer-reviewed)abstract We consider a nonlinear first order stochastic difference equation which may be viewed as a stochastic perturbation of {\it W. E. Ricker's} [J. Fish. Res. Bd. Can. 11, 559-623 (1954)] deterministic model of population growth. Numerical experiments seem to suggest that the corresponding Markov process has a stationary probability distribution but this is shown to be false by proving that the process is in fact null recurrent
2.	Gyllenberg, Mats, et al. (author) Population models with environmental stochasticity 1994 In: Journal of Mathematical Biology. - 0303-6812 .- 1432-1416. ; 32:2, s. 93-108 Journal article (peer-reviewed)abstract Two discrete population models, one with stochasticity in the carrying capacity and one with stochasticity in the per capita growth rate, are investigated. Conditions under which the corresponding Markov processes are null recurrent and positively recurrent are derived

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