1. J. François, Metab. Pediat. Ophthal.2, 3 (1978).
2. P.A. Knepper, M. Breen, H.G. Weinstein and L.J. Blacik, Exp. Eye Res.27, 567 (1978).
3. B.I. Weinstein, K. Altman, G.G. Gordon, M. Dunn and A.L. Southren, Invest. Ophthal. visual Sci.16, 973 (1977).
4. A. Tchernitchin, E.J. Wenk, B.I. Weinstein, M.W. Dunn, G.G. Gordon and A.L. Southren, Metab. Pediat. Ophthal.3, 37 (1979).
5. W.E. Stumpf and L.J. Roth, J. Histochem. Cytochem.14, 274 (1966).