The index of signature operators on Lipschitz manifolds Nicolae Teleman (1983) Publications Mathématiques de l'IHÉS
The New Neumann Operator Associated with Deformations of Strongly Pseudo Convex Domains and Its Application to Deformation Theory. Takao Akahori (1982) Inventiones mathematicae
Théorème de Kirchhoff et théorie de Hodge Yves Colin de Verdière (1990/1991) Séminaire de théorie spectrale et géométrie
Theta Functions Defined by Geodesic Cycles in Quotients of SU(P,1). Y.L. Tong, S.P. Wang (1983) Inventiones mathematicae