Lippmaa, E.; Maremäe, E. (2000). «Uranium production from the local Dictyonema shale in North-East Estonia». Oil Shale. A Scientific-Technical Journal (Estonian Academy Publishers) 17 (4): 387–394. ISSN0208-189X.
Maremäe, E. (2001). «Extraction of uranium from local Dictyonema shale at Sillamäe in 1948–1952». Oil Shale. A Scientific-Technical Journal (Estonian Academy Publishers) 18 (3): 259–271. ISSN0208-189X.
Lippmaa, E.; Maremäe, E. (2003). «The beginnings of uranium production in Estonia». Oil Shale (Estonian Academy Publishers) 20 (2): 167–174. ISSN0208-189X.