Jenko, Marjan (2005). "O pomenu meridiana 15° vzhodno od Greenwicha" [About the Significance of the 15th Degree to the East of Greenwich Meridian] (PDF). Geodetski vestnik (بالسلوفينية). Vol. 49, no. 4. pp. 637–638. Archived from the original(PDF) on 2017-10-14. Retrieved 2010-01-05.
Jenko, Marjan (2005). "O pomenu meridiana 15° vzhodno od Greenwicha" [About the Significance of the 15th Degree to the East of Greenwich Meridian] (PDF). Geodetski vestnik (بالسلوفينية). Vol. 49, no. 4. pp. 637–638. Archived from the original(PDF) on 2017-10-14. Retrieved 2010-01-05.