For citations:

Bikchentaev A.M., Khadour M. Differences of idempotents in C^∗-algebras and the quantum Hall effect. II. Unbounded idempotents. Mathematics and Theoretical Computer Science. 2023;1(4):35-48. (In Russ.) https://doi.org/10.26907/2949-3919.2023.4.35-48