@article{article55e3ce86,
title   = {A sapphirine-orthopyroxene-spinel occurence in the Piên area, Paraná, southern Brazil},
author = {Girardi, Vicente Antonio Vitorio and Ulbrich, H.},
year = {1978},
doi = {10.25249/0375-7536.1978284293},
journal   = {Revista Brasileira de Geociências}
}