Continuous growth models in terms of generalized logarithm and   exponential functions
  Consider the one-parameter generalizations of the logarithmic and exponential functions which are obtained from the integration of non-symmetrical hyperboles. These generalizations coincide to the one obtained in the context of non-extensive thermostatistics. We show that these functions are suitable to describe and unify the great majority of continuous growth models, which we briefly review. Physical interpretation to the generalization function parameter is given for the Richards' model, which has an underlying microscopic model to justify it. 
Alexandre Souto Martinez, Rodrigo Silva Gonzalez and Cesar Augusto   Sangaletti Tercariol