Negrobov, O. P., Grichanov, I. Y. and Selivanova, O. V. (2017) “Review of East Palaearctic species of Sympycnus Loew, 1857, with a key to species”, Zootaxa. Auckland, New Zealand, 4277(4), pp. 531–548. doi: 10.11646/zootaxa.4277.4.4.