PageHeader : Funkcialaj Ekvacioj, 35 (1992) 1-18
section : ��0. Introduction and main results
section : ��1. Proof of Theorem A
section : ��2. Proof of Theorem $\mathrm{B}$
section : ��3. Proof of the corollary of Theorem $\mathrm{B}$
section : ��4. Proof of Theorem $\mathrm{C}$
section : References