1. A. L. Skubachevskii, Elliptic Functional Differential Equations and Applications, Birkhäuser, Basel–Boston–Berlin, 1997.
2. A. L. Skubachevskii, “Boundary Value Problems for Elliptic Functional-Differential Equations and Their Applications”, Russian Math. Surveys øperatornamevol 71, :5 (2016), 801–906.
3. A. Antonevich, M. Belousov, and A. Lebedev, Functional Differential Equations: II. $$C^*$$-Applications. Part 2: Equations with Discontinuous Coefficients and Boundary Value Problems, Longman, Harlow, 1998.
4. A. B. Antonevich and A. V. Lebedev, “Functional Equations and Functional Operator Equations. A $$C^*$$-Algebraic Approach”, Amer. Math. Soc. Transl. Ser. 2, vol. 199, Amer. Math. Soc., Providence, RI, 2000, 25–116.
5. A. Connes, Noncommutative Geometry, Academic Press Inc., San Diego, CA, 1994.