On the index of first-order elliptic operators in the plane
Differencialʹnye uravneniâ, Tome 28 (1992) no. 5, pp. 818-827.

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     author = {S. Baizaev and \`E. Muhamadiev},
     title = {On the index of first-order elliptic operators in the plane},
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S. Baizaev; È. Muhamadiev. On the index of first-order elliptic operators in the plane. Differencialʹnye uravneniâ, Tome 28 (1992) no. 5, pp. 818-827. http://geodesic.mathdoc.fr/item/DE_1992_28_5_a9/