Degtyarev, S. P. “On the Instantaneous Shrinking of the Support of a Solution to the Cauchy Problem for an Anisotropic Parabolic Equation”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 61, no. 5, May 2009, pp. 625-40, https://umj.imath.kiev.ua/index.php/umj/article/view/3046.