Liu, Y.-L., R. Zhang, C. Ren, B. Liu, Y. Zhang, and M. Tang. β€œOn the Specific Identity of Chinese Endemic Species Synotis longipes (Compositae-Senecioneae)”. Phytotaxa, vol. 472, no. 3, Nov. 2020, pp. 269–276, doi:10.11646/phytotaxa.472.3.5.