Geodesic
On the strong extremum principle for a D-$(\Pi,\Omega)$-elliptically connected operator of second order
Sbornik. Mathematics, Tome 40 (1981) no. 1, pp. 21-50 Cet article a éte moissonné depuis la source Math-Net.Ru

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In this paper the strong extremum principle is proved for a certain new class of second order operators with nonnegative characteristic form, without requiring the smoothness of their coefficients, which is essential in the converse of Rashevskii's theorem on completely nonholonomic systems. Bibliography: 19 titles. 
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L. I. Kamynin; B. N. Khimchenko. On the strong extremum principle for a D-$(\Pi,\Omega)$-elliptically connected operator of second order. Sbornik. Mathematics, Tome 40 (1981) no. 1, pp. 21-50. http://geodesic.mathdoc.fr/item/SM_1981_40_1_a1/

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