Process equation as a model for the development of cells Fahimeh Nazarimehr, Seyedeh Sanaz Hosseini, Abdul Jalil M. Khalaf, Sajad Jafari and Julien C. Sprott Eur. Phys. J. Special Topics, 229 6-7 (2020) 921-927 Published online: 26 March 2020 DOI: 10.1140/epjst/e2020-900089-7