Chinese equivalent of Anna's Archive for academic papers?

[u/multi-Pingouin]

I'm doing research that requires relying on work by researchers from mainland China (PRC), but I can't find much of it on Anna's Archive.

Does anyone know of a Chinese-language equivalent of Anna's Archive for finding academic papers, theses, and books published in Mandarin by Chinese researchers/institutions easily?

Any pointers (sites, forums, or communities) would be much appreciated. Thanks!