MathSciNet bibliographic data MR1457736 35K10 (35A08) Zhang, Qi S. Gaussian bounds for the fundamental solutions of \$\nabla (A\nabla u)+B\nabla u-u_t=0\$$\nabla (A\nabla u)+B\nabla u-u_t=0$. Manuscripta Math. 93 (1997), no. 3, 381–390. Article

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