Detection of selenium in environmental samples, inorganic mixtures, and a specific method for its gravemetric analysis S.G. Aggarwal, B.D. Diwan, S. Agarwal, P. Singh, V.K. Gupta et G. L. Mundhara J. Phys. IV France, 107 (2003) 7-12 DOI: 10.1051/jp4:20030231