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Marconi, A. and Abrahão, I.O. 1976. Simetry of stereograms used in the determination of the optical indicatrix of minerals . Anais da Escola Superior de Agricultura Luiz de Queiroz. 33, (Jan. 1976), 407–413. DOI:https://doi.org/10.1590/S0071-12761976000100037.