Geodesic
First and second order differentiation operators with weight functions of variable sign
Matematičeskie zametki, Tome 56 (1994) no. 1, pp. 3-15 
A. P. Gurevich; A. P. Khromov. First and second order differentiation operators with weight functions of variable sign. Matematičeskie zametki, Tome 56 (1994) no. 1, pp. 3-15. http://geodesic.mathdoc.fr/item/MZM_1994_56_1_a0/
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Voir la notice de l'article provenant de la source Math-Net.Ru

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