Abstract
Part of periodicity of solutions of the difference equation
Sn+1 = Sn-p (alpha + aS(n-q)+bS(n-r)/cS(n-q)+dS(n-r))
are investigated, where alpha,a,b,c and d is an element of (0,infinity). The initial conditions S-p,S-p+1, ... , S-q, S-q+1, ... , S-r, S-r+1, ... , S-1 and S-0 are arbitrary positive real numbers such that p > q > r >= 0. To exemplify the theoretical discussion, some numerical examples are presented.