L. Martirosyan, R. Sargsyan, A. Grigoryan, and Q. Harutyunyan, “ESTIMATION OF GEOMORPHOLOGICAL RESOURCES OF NORTHERN ARMENIA FOR DEVELOPMENT OF RECREATION AND TOURISM”, Proc. YSU C: Geol. Geogr. Sci., vol. 52, no. 2 (246), pp. 133–140, Aug. 2018.