On Li-Yau gradient estimate for sum of squares of vector fields up to higher step

Chang, D.-C.D.-C.ChangSHU-CHENG CHANGLin, C.C.Lin2020-12-252020-12-252020https://www.scopus.com/inward/record.url?eid=2-s2.0-85090863245&partnerID=40&md5=bf470af9824ce1765575f46f6f6a2f46https://scholars.lib.ntu.edu.tw/handle/123456789/533265On Li-Yau gradient estimate for sum of squares of vector fields up to higher stepjournal article10.4310/CAG.2020.v28.n3.a42-s2.0-85090863245