Photoacoustic analysis of trace gas emitted by ceramic industries in the northern region of Rio de Janeiro state R.T. Faria Jr., M.P.P. Castro, J. Alexandre, R. Toledo, L.O. Carneiro, W.S. Ribeiro, M.S. Sthel, D.U. Schramm et H. Vargas J. Phys. IV France, 125 (2005) 837-840 DOI: 10.1051/jp4:2005125193