Caracterization of color centers and dichroism in some Brazilian species of tourmaline using photoacoustic technique R.J.S. Lima, A.S. Vasconcelos, R.R. Wegner et J.F. SuassunaJ. Phys. IV France, 125 (2005) 47-50DOI: https://doi.org/10.1051/jp4:2005125012