1. Geochemical correlation of oils and source rocks from central and NE Syria;Abboud;Journal of Petroleum Geology,2005
2. Alkaş, İ., 1989. Drillings report of Avgamasya and Segürek asphaltite ocurrences, MTA report no: 8734, Ankara, (in Turkish, unpublished).
3. Alkaş, İ., 1990. Drillings report of Üçkardeşler, Harbul and Silip (Silopi-Mardin) asphaltite occurrences. MTA report no: 9009 (in Turkish, unpublished).
4. Geology of east and southeast Anatolia region;Altinli;MTA Bulletin,1966
5. Occurence and formation of tricyclic and tetracyclic terpanes in sediments and petroleum;Aquino neto,1983