Dier, D., Kassmann, M. and Zacher, R. 2021. Discrete versions of the Li-Yau gradient estimate . ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE. 22, 2 (Jun. 2021), 691-744. DOI:https://doi.org/10.2422/2036-2145.201807_005.