1. Nonlinear Partial Differential Equations in Engineering, vol. 2;Ames,1972
2. Elements of Physical Biology;Lotka,1925
3. Variazioni e fluttuazioni del numero d'individui in specie animali conviventi;Volterra;Mem. R. Acad. Naz. Lincei,1926
4. Mathematical Biology;Murray,1993
5. Competition with evolution in ecology and finance;Sprott;Phys. Lett. A,2004