A joint article titled "Eigenfunction expansion for impulsive singular Hahn-Dirac system" by Hamlet Isakhanli, the founder of Khazar University, Chairman of the Board of Directors and Trustees, professor of the Mathematics Department, academician, and Bilender Allahverdiyev, professor of the same department, has been published in the journal "Rendiconti del Circolo Matematico di Palermo Series 2" (2024, Volume 73, No. 5). It should be noted that the journal "Rendiconti del Circolo Matematico di Palermo Series 2" is indexed in the "Web of Science" and "Scopus" databases.

In this study, a singular impulsive Hahn-Dirac system is studied. A spectral function has been established for this type of system. With the help of this function, the Parseval equation and eigenfunction expansion were obtained.

https://link.springer.com/article/10.1007/s12215-024-01028-0

https://link.springer.com/journal/12215