Geodesic
Harvest optimization for Rikker's population, when environment parameters limiting population growth change cyclically
Dalʹnevostočnyj matematičeskij žurnal, Tome 4 (2003) no. 1, pp. 127-133.

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In this paper the problem of optimal harvest from Rikker's population is solved provided that harvest rate is determined by population size and environment parameters limiting population growth change cyclically. It is shown, that for these populations the optimal harvest rate is determined by the amplitude of parameters variation, while the optimal harvest rate policy is to alternate years of intensive harvesting with the years of negligibly small harvesting 
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E. V. Ashikhmina; Yu. G. Izrailsky; E. Ya. Frisman. Harvest optimization for Rikker's population, when environment parameters limiting population growth change cyclically. Dalʹnevostočnyj matematičeskij žurnal, Tome 4 (2003) no. 1, pp. 127-133. http://geodesic.mathdoc.fr/item/DVMG_2003_4_1_a12/

[1] U. U. Riker, Metody otsenki i interpretatsii biologicheskikh pokazatelei populyatsii ryb, Pischevaya prom-st, M., 1979, 137 pp.

[2] E. V. Ashikhmina, E. I. Skaletskaya, E. Ya. Frisman, A. N. Kulikov, Matematicheskaya model dinamiki velichiny zagotovok na primere lokalnoi populyatsii manchzhurskoi belki, Preprint No 23(53) IAPU DVNTs AN SSSR, Vladivostok, 1981, 14 pp.

[3] E. V. Ashikhmina, A. N. Kulikov, E. I. Skaletskaya, E. Ya. Frisman, “Matematicheskoe modelirovanie dinamiki velichiny zagotovok lokalnoi populyatsii manchzhurskoi belki”, Sciurus vulgaris mantchuricus, Zhurn. obsch. biologii, 43:5 (1982), 705–711

[4] E. Ya. Frisman, S. P. Luppov, E. V. Ashikhmina, “Matematicheskaya model dinamiki chislennosti lokalnoi populyatsii, podverzhennoi sezonnomu promyslu”, Matematicheskoe modelirovanie v populyatsionnoi ekologii, DVNTs AN SSSR, Vladivostok, 1985, 43–54

[5] E. V. Ashikhmina, E. Y. Frisman, E. Skaletskaya, A. N. Kulikov, “Mathematical model for dynamics of the number of pelt products from the local population of mantchurian squirrels”, Ecolog. Model., 30 (1985), 145–156 | DOI