Liang, Ze-Rui, and De-Liang Yao. 2022. “On the Nature of X(6900) and Other Structures in the LHCb Di-j/ψ Spectrum”. Suplemento De La Revista Mexicana De Física 3 (3):0308042 1-5. https://doi.org/10.31349/SuplRevMexFis.3.0308042.