TY - JOUR AU - Yong Zhang TI - Some observations on the Diophantine equation $f(x)f(y)=f(z)^2$ JO - Colloquium Mathematicum PY - 2016 SP - 275 EP - 283 VL - 142 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/cm142-2-8/ DO - 10.4064/cm142-2-8 LA - en ID - 10_4064_cm142_2_8 ER -