The Riemann-Roch theorem for elliptic operators and solvability of elliptic equations with addititonal conditions on compact subsets. Michael Gromov; Mikhail A. Shubin — 1994 Inventiones mathematicae
The Riemann-Roch theorem for elliptic operators and solvability of elliptic equations with additional conditions on compact subsets Mikhael Gromov; Mikhail A. Shubin — 1993 Journées équations aux dérivées partielles