Application of the photoacoustic method to the measurement of acetylene reduction by nitrogenase enzyme D.U. Schramm, M.S. Sthel, L.O. Carneiro, A.A. Franco, A.C. Campos et H. Vargas J. Phys. IV France, 125 (2005) 31-33 DOI: 10.1051/jp4:2005125008