1. ALEXANDROV, E.A., ECONOMIC GEOLOGY 50: 459 (1955).
2. BARGHOORN, E.S., FOSSIL ORGANISMS FROM PRECAMBRIAN SEDIMENTS, ANNALS OF THE NEW YORK ACADEMY OF SCIENCES 108: 451 (1963).
3. BARGHOORN, E. S., GEOLOGICAL SOCIETY OF AMERICA MEMOIR 67 2: 75 (1957).
4. BRODERICK, T.M., ECONOMIC GEOLOGY 15: 422 (1920).
5. Michipicoten iron ranges;Geological Survey of CanadaMemoir,1926