Verhulst, Ferdinand <br/><br/>
Nonlinear differential equations and dynamical systems 
Ferdinand Verhulst 
 - Berlin  Springer-Verlag  1990 
 - 277 p. : ll. ; 24 cm. 
<br/><br/>p. 271-274 
<br/><br/><label>ISBN: </label>3540506284 
<br/><br/><label>LCCN: </label>89-21770 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations, Nonlinear<br/>Differentiable dynamical systems