Faraj, F. A. M., T. Šolević Knudsen, K. Stojanović, S. Ivković Pavlović, H. P. Nytoft, and B. Jovančićević. “GC–MS Vs. GC–MS-MS Analysis of Pentacyclic Terpanes in Crude Oils from Libya and Serbia – A Comparison of Two Methods”. Journal of the Serbian Chemical Society, vol. 82, no. 11, Dec. 2017, pp. 1315-31, doi:10.2298/JSC170419075A.