On general boundary-value problems for elliptic equations
Sbornik. Mathematics, Tome 189 (1998) no. 10, pp. 1573-1586

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A theory of general boundary-value problems is developed for differential operators with symbols not necessarily satisfying the Atiyah–Bott condition that the corresponding obstruction must vanish. A condition ensuring that these problems possess the Fredholm property is introduced and the corresponding theorems are proved.
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     title = {On general boundary-value problems for elliptic equations},
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B. Yu. Sternin; V. E. Shatalov; B. Schulze. On general boundary-value problems for elliptic equations. Sbornik. Mathematics, Tome 189 (1998) no. 10, pp. 1573-1586. http://geodesic.mathdoc.fr/item/SM_1998_189_10_a7/