Zhao, Y., S. Liu, Y. Cao, Q. Ma, and Y. Yan. “MULTIPLICITY OF POSITIVE PERIODIC SOLUTIONS FOR A NICHOLSON-TYPE BLOWFLIES MODEL WITH NONLINEAR DECIMATION TERMS”. Advances in Differential Equations and Control Processes, Vol. 28, June 2022, pp. 37–53, doi:10.17654/0974324322023.