  For the model of periodic chronic myelogenous leukemia considered by
Pujo-Menjouet, Mackey et al., model consisting of two delay differential
equations, the equation for the density of so-called "resting cells" was
studied from numerical and qualitative point of view in several works. In this
paper we focus on the equation for the density of proliferating cells and study
it from a qualitative point of view.
