As of 2018, Int. J. Notes on Number Theory and Discrete Mathematics will obtain digital object identifiers (DOIs) for its published papers, due to a contract with the “Prof. Marin Drinov” Academic Publishing House of the Bulgarian Academy of Sciences.
The DOI scheme of a paper is intuitively constructed from the paper’s bibliographic data, as shown in the example below with DOI: 10.7546/nntdm.2018.24.1.1-4.
