Wiśniowski, B., Lien, N.T.P. and Cuong, N.Q. 2020. Discovery of four new species of Trichrysis Lichtenstein, cyanea species group (Hymenoptera, Chrysididae) from Vietnam. Zootaxa. 4881, 1 (Nov. 2020), 165–178. DOI:https://doi.org/10.11646/zootaxa.4881.1.10.