Repina 1964. [Palaeontological Atlas. 2.Trilobites]. Biostratigraphy of the Lower Cambrian of the Sayan-Altai folded region., L. N. Repina, V. V. Khomentovsky, I. T. Zhuravleva & A. Yu. Rozanov, Biostratigraphy of the Lower Cambrian of the Sayan-Altai folded region.] Akad. Nauk SSSR, Moscow 1964 : 252-364 pl. 31-48 [Russian].", 1964: 252-364. Chapter pagination: 252-364