1. V. M. Gol'dshtein, V. I. Kuz'minov, and I. A. Shvedov, ?On the normal and compact solvability of the operator of exterior differentiation under homogeneous boundary conditions,? Sib. Mat. Zh.,28, No. 4, 82?96 (1987).
2. V. M. Gol'dshtein, V. I. Kuz'minov, and I. A. Shvedov, ?Dual spaces of spaces of differential forms,? Sib. Mat. Zh.,27, No. 1, 45?56 (1986).
3. V. M. Gol'dshtein, V. I. Kuz'minov, and I. A. Shvedov, ?Integral representation of the integral of a differential form,? in: Functional Analysis and Mathematical Physics [in Russian], Akad. Nauk SSSR, Sib. Otd., Inst. Mat., Novosibirsk (1985).
4. N. N. Tarkhanov, ?A formula and estimates for the solutions of the equation du=f in a domain and on the boundary of a domain,? Izv. Vyssh. Uchebn. Zaved., Mat., No. 5, 58?66, (1980).