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2. On Itacolumite;Blake;Proc. Acad. Nut. Sci. Phila,1867
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4. Torsion Properties of Itacolumite (Flexible Brazilian Sandstone), Crummendorf Quartz-Schist, and Some Sandstones;Endell;Ber. Deut. Keram. Ges,1938
5. Susceptibility of Itacolumite to Torsion;Endell;Inst. Technol. Research, Silo Paulo, Bull,1939