Yordan Uzunov, Liudmila Kapustina (1993): Current review on Oligochaeta from macrozoobenthic communities of the Bulgarian rivers – Lauterbornia – 1993_13: 73 - 83.
J. Uzunov, Vessela Tzavkova, Ivan Todorov, Emilia Varadinova (2001): The macrozoobenthic fauna of the Biospere reserve Srebarna Lake in North-Eastern Bulgaria. – Lauterbornia – 2001_40: 43 - 51.