Geodesic
An estimate of the probability that a~degenerate diffusion process hits a~set of positive measure
Izvestiya. Mathematics , Tome 28 (1987) no. 2, pp. 201-231

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The Krylov–Safonov estimate for the probability that a nondegenerate diffusion process hits a set of positive measure is extended to the case of a process with degeneration. Using this estimate it is proved that the corresponding Markov process is strong Markov. Bibliography: 16 titles. 
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     author = {S. V. Anulova},
     title = {An estimate of the probability that a~degenerate diffusion process hits a~set of positive measure},
     journal = {Izvestiya. Mathematics },
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S. V. Anulova. An estimate of the probability that a~degenerate diffusion process hits a~set of positive measure. Izvestiya. Mathematics , Tome 28 (1987) no. 2, pp. 201-231. http://geodesic.mathdoc.fr/item/IM2_1987_28_2_a0/