Who does Fang Zhe and Jun Li refer to?

"The United States folds and strengthens the bones" refers to Liu Gongquan's words. In the middle Tang Dynasty, Liu Gongquan was a calligrapher and poet. Liu Gongquan was famous for his regular script. He was a beginner of Wang Xizhi's calligraphy, and later visited a famous calligrapher in the Tang Dynasty. He absorbed the strengths of Yan Zhenqing and Ou Yangxun, absorbed new ideas and created his own unique Liu Ti. He is good at strengthening muscles and bones, and his descendants have a reputation for Yan.

The full name of "Xuanta Monument" is "Records of Monks in Zuo Jie in Tang Dynasty", which enshrines the Xuanta Monument inscribed for Zida exorcist by three religions who taught and guided Dade and Angu Temple. It was written by Pei Xiu, then prime minister, and Liu Gongquan, a calligrapher, in the first year of Tang Huichang (84 1). It is a regular calligraphy work. Now it is preserved in the second room of Xi 'an Stele Forest. In the overall book style of the mysterious tower monument, Liu's style is strict and his face is fat. But in the late Tang Dynasty, people appreciated Liu Ti with a new style of calligraphy and its charming beauty. It is a milestone in Liu Gongquan's calligraphy creation career, marking the complete maturity of Liu Ti calligraphy. It has always been regarded as an authentic model for children to learn books and other beginners, which has a far-reaching impact on future generations.