1. Mayer A., Salsi S., Peltier A., Demange M., Diebold F. and Kanper E., Cah. Notes Doc. 101. Note 1281-101-80.
2. M.T.S.D. Vasconcelos, M.S. Barbosa, A.A.S.C. Machado and P.H.P. Silva, presented at the 1st International Scientific Conference of the International Occupational Hygiene Association, Brussels. 1992, abstracts, p. 75.
3. M.T.S.D. Vasconcelos, A.A.S.C. Machado and P.A.P. Silva, in preparation.