Ivert, P.-A., N. Marola, and M. Masson. “Energy Estimates for Variational Minimizers of a Parabolic Doubly Nonlinear Equation on Metric Measure Spaces”.
Annales Fennici Mathematici
, vol. 39, no. 2, Aug. 2014, pp. 711-9, doi:10.5186/aasfm.2014.3936.