@article{article038a5b4d,
title   = {Mineralogy of nepheline syenites from the Poços de Caldas alkaline massif, SE Brazil: chemistry, x-ray data and microtextures of feldspars},
author = {Ulbrich, Mabel N. C.},
year = {1993},
doi = {10.25249/0375-7536.1993234388399},
journal   = {Revista Brasileira de Geociências}
}