1. Modeling the dynamics of language death;Abrams;Nature,2003
2. Modeling language competition;Patriarca;Physica A,2004
3. Differential Equations, Dynamical Systems, and Linear Algebra;Hirsch,1974
4. Mathematical Biology I. An Introduction;Murray,2002
5. J. Epstein, Non Linear Dynamics, Mathematical Biology and Social Science, Addison-Wesley, Reading, MA, Santa Fe Institute, 1997.