  The study of biharmonic submanifolds, initiated by B. Y. Chen and G. Y. Jiang
independently, has received a great attention in the past 30 years with many
important progress. This note attempts to give a short survey on the study of
biharmonic Riemannian submersions which are a dual concept of biharmonic
submanifolds (i.e., biharmonic isometric immersions).
