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The Poisson kernel for certain degenerate elliptic operatorsBEN AROUS, G; KUSUOLA, S; STROOCK, D. W et al.Journal of functional analysis. 1984, Vol 56, Num 2, pp 171-209, issn 0022-1236Article

Compatibility operators for degenerate elliptic equations on the ball and Heisenberg groupGRAHAM, C. R.Mathematische Zeitschrift. 1984, Vol 187, Num 3, pp 289-304, issn 0025-5874Article

Elliptic differential operators and diffusion processesBAUER, H.Bulletin of the Australian Mathematical Society. 1984, Vol 30, Num 2, pp 219-237, issn 0004-9727Article

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Equations ellipiques du second ordre sur les graphesMERKOV, A. B.Matematičeskij sbornik (Moskva). 1985, Vol 127, Num 4, pp 502-518, issn 0368-8666Article

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Negatively curved manifolds, elliptic operators, and the Martin boundaryANCONA, A.Annals of mathematics. 1987, Vol 125, Num 3, pp 495-536, issn 0003-486XArticle

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