Especially in ancient times.
For example, Li Bai, Du Fu, Wang Wei and Li He. Poet refers to Li Bai, poet refers to Du Fu, Shi Fo refers to Wang Wei, and Shi Gui refers to Li He. Li Bai's Guan Shanyue
Up the Mountain by Du Fu, Poems by Li Ping and Autumn Night by Wang Wei.
In addition, there are Meng Jiao's Fu of Bitterness and Cold, He's Poem on Willow, Jia Dao's Chai Lu and Bai Juyi's Song of Eternal Sorrow. . .