International Journal “Notes on Number Theory and Discrete Mathematics” is a non-commercial all-volunteer journal.

We do NOT charge authors with article publication charges.

We do NOT charge readers with access fees.

In electronic version, the full NNTDM contents is available free-of-charge through the Journal website.

Additionally, NNTDM offers its authors and readers the opportunity to purchase copies or make annual subscription to the printed version of the Journal. We accept bank transfers and issue invoices.

Prices (as of January 2022):

  • Price for a single copy of any volume/number – 30 EUR
  • Annual subscription (4 copies/year) – 120 EUR.

Details for bank transfer:

  • Account holder: Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences
  • Holder address: 21 Acad. Georgi Bonchev Str., Sofia 1113, Bulgaria
  • Bank name: UniCredit Bulbank, Branch “Kaloyan”
  • Bank address: 7 Sveta Nedelya Sq., Sofia 1000, Bulgaria
  • Bank account number / IBAN: BG47 UNCR 7630 3400 0011 99

Please note that all bank charges are on the account of the ordering side (you). The postal charges for the delivery are on behalf of the Journal (us).

Please let us know by email ( which issues you would like to purchase, as well as provide the necessary invoice details and postal address for delivery.

We issue invoices for every bank transfer that we receive.

  • For an institutional invoice, please submit the following information:
    • Name of the organization (obligatory)
    • VAT number of the organization (obligatory)
    • Delivery address (obligatory)
    • Billing address (optional)
    • Person in charge (optional)
  • For an individual invoice, please submit the following information:
    • Name of the recipient (obligatory)
    • Personal identification number (obligatory)
    • Delivery address (obligatory)

Please let us know if you need a preliminary proforma invoice.

For delivery, we use the services of the Bulgarian National Posts and provide links with tracking numbers for every delivery.

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