JOURNAL OF MATHEMATICAL PHYSICS, vol.36, no.7, pp.3485-3491, 1995 (SCI-Expanded)
It is shown that the integrable subclasses of the equations q(,t)=f(x,t)q(,3) +H(x,t,q,q(,1)) are the same as the integrable subclasses of the equations q(,t)=q(,3) +F(q,q(,1)). (C) 1995 American Institute of Physics.