in D. L. Kaljo, Fatsii i fauna silura Pribaltiki [Facies and fauna of the Baltic Silurian]

Biogermnaya fatsiya v yuuruskom gorizonte (nizhniy llandoveri) v severo-zapadnoy Estonii [Biohermal facies in the Juuru stage (Lower Llandoverian) in NW Estonia] - 1977