Jegorova 1984. [New trilobites of the Upper Cambrian of the Siberian Platform.] Surkov, V.S.[Ed]. Novye vidy drevnikh bespozvonochnykh i rastenii neftegazonosnykh provintsii Sibiri. [New species of fossil invertebrates and plants from oil and gas bearing provinces of Siberia.], Siberian Geol. Research Institute, Novosibirsk, 1984: 55-60, 94-96. Chapter pagination: 19-28, 91