CHEN Feng-de. Periodic solutions and almost periodic solutions for a delay multispecies Logarithmic population model [J]. Applied Mathematics and Computation, 2005(2):760-770.doi:10.1016/j.amc.2005.01.085.
CHEN Feng-de, SHI Chun-ling. Dynamic behavior of a Logistic type equation with infinite delay [J]. Acta Mathematicae Applicatae Sinica, 2006(2):313-324.
[5]
ATKINSON E N, BARTOSZYNSKI R, BROWN B W. On estimating the growth function of tumors [J]. Mathematical Biosciences, 1989(2):121-136.