1. L. Hörmander, The Analysis of Linear Partial Differential Operators, Vol. 3: Pseudo-Differential Operators [Russian translation], Mir, Moscow (1987).
2. M. S. Agranovich, “Elliptic operators on closed manifolds,” in: VINITI Series in Contemporary Problems of Mathematics (Fundamental Trends) [in Russian], Vol. 63, VINITI, Moscow (1990), pp. 5–129.
3. L. Hörmander, Linear Partial Differential Operators [Russian translation], Mir, Moscow (1965).
4. L. P. Volevich and B. P. Paneyakh, “Some spaces of generalized functions and imbedding theorems,” Usp. Mat. Nauk, 20, No. 1, 3–74 (1965).
5. V. A. Mikhailets and A. A. Murach, “Elliptic operators in the improved scale of functional spaces,” Ukr. Mat. Zh., 57, No. 5, 689–696 (2005).