The study of Shuo Wen Jie Zi has reached a new height. Shuowen Zhu Duan is one of them. If you want to corroborate each other, you can look at several other experts who study Shuowen, such as Shuo Wen Yi Zheng by Gui Fu, Shuo Wen Ju Reading and Shuo Wen Example Interpretation by ieee fellow, and Shuo Wen Tong Xun Fang by Zhu.