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Feitsma, K G., D S. Postma, G H. Koëter, G D. Nossent, B F. Brenth, i R A. de Zeeuw. Comparative Study of the Bronchodilating Effects of (-)- and (+)-oxyphenonium Bromide. 1988.

Feitsma, K G., et al. Comparative Study of the Bronchodilating Effects of (-)- and (+)-oxyphenonium Bromide. 1988.