1. Gerdzhikov, I., D. Vangelov. I. Glabadanidu. 2012. One underestimated geological hazard: the debris flows – Rev. Bulg. Geol. Soc., 73, 1–3, 85–104 (in Bulgarian with English abstract).
2. Horton, R. E. 1932. Drainage basin characteristics. – Eos, Тransact. Аmerican Geophys. Union, 13, 1, 350–361; https://doi.org/10.1029/TR013i001p00350.
3. Horton, R. E. 1945. Erosional development of streams and their drainage basins; hydrophysical approach to quantitative morphology. – Bull. Geol. Soc. Аmer., 56, 3, 275–370; https://doi.org/10.1130/0016-7606(1945)56[275:EDOSAT]2.0.CO;2.
4. Hristova, N., N. Petkanski. 2014. Morphometic analysis of drainage basin of Luda Jana River. – Ann. Univ. Sofia, 106, 2–géograph., 49–65 (in Bulgarian with English abstract).
5. Krenchev, D., N. Hristova. 2019. Morphometric parameters of river network in Pirin Mountain in Bulgaria – Ann. Univ. Sofia, 112, 2–géograph., 7–24 (in Bulgarian with English abstract).