Nonautonomous ultraparabolic equations applied to population dynamics. Ghouali, Noureddine, Touaoula, Tarik Mohamed (2005) Electronic Journal of Differential Equations (EJDE) [electronic only]
Nonlinear integroparabolic equations on unbounded domains: existence of classical solutions with special properties. Lavrent'ev , M.M., Spigler, R., Akhmetov, D.R. (2001) Sibirskij Matematicheskij Zhurnal