Professor Sheldon Lu wrote and published a new monograph (in Chinese) in 2022: Lyric Poetry and Solidarity Society in Hong Kong in the 1950s 一九五〇年代香港詞壇與堅社. Hong Kong: Chung Hwa Book Co. 中華書局, 2022.

Here is a link: https://www.chunghwabookstore.com/products/1-9789888807505

Congratulations, Sheldon!