Iftikhar Adil oglu Eyyubov defended his dissertation on the topic "Study of the Interaction of Surface and Groundwater in the Oguz-Gabala Zone" for the degree of Doctor of Philosophy in the specialty of Hydrology at the one-time dissertation council of the BFD 3.14 of Higher Attestation Commission under the President of the Republic of Azerbaijan, established at the Institute of Geography named after аcad.H. Aliyev.