                                                                                  2_
*****  

data  -      

              du/dt = f1(u(t-TAU1)) + f2(u(t-TAU2)) - TETA*u.  

                   f1(u) = ALFA1/(1 + BETA1*u^GAMA1),  

                   f2(u) = ALFA2/(1 + BETA2*u^GAMA2),  


*****


