J. P. CID, L. V. S. NARDI, e P. E. GISBERT, “Textural Relations of Lamprophyric Mafic Microgranular Enclaves and Petrological Implications for the Genesis of Potassic Syenitic Magmas: the example of Piquiri Syenite, southern Brazil”, PESQUI GEOCIENC, vol. 29, nº 2, p. 21–30, dez. 2002.