Geodesic
Estimates of the fundamental solution for an elliptic equation in divergence form with drift
Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 48, Tome 489 (2020), pp. 7-35

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For a second-order linear divergence-form elliptic equation with uniformly elliptic measurable principal coefficients and with drift we establish a condition on lower order coefficients that guarantees classical two-sided bounds of the fundamental solution. 
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     author = {Yu. A. Alkhutov and M. D. Surnachev},
     title = {Estimates of the fundamental solution for an elliptic equation in divergence form with drift},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {7--35},
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     volume = {489},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2020_489_a0/}
}
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Yu. A. Alkhutov; M. D. Surnachev. Estimates of the fundamental solution for an elliptic equation in divergence form with drift. Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 48, Tome 489 (2020), pp. 7-35. http://geodesic.mathdoc.fr/item/ZNSL_2020_489_a0/