APA (7th ed.) Citation

Nest, R., & Tsygan, B. (1993). Formal versus analytic index theorems.

Chicago Style (17th ed.) Citation

Nest, Ryszard, and Boris Tsygan. Formal Versus Analytic Index Theorems. København, 1993.

MLA (9th ed.) Citation

Nest, Ryszard, and Boris Tsygan. Formal Versus Analytic Index Theorems. 1993.

Warning: These citations may not always be 100% accurate.