15. Crano C, Guglielmetti RJOrganic Photochromic and Thermochromic Compounds, in Main Phtochromic Families, New York, p 65 (1999)
16. Choi Y, Kim E, Tetrahedron Lett., 39, 8861 (1998)
17. Tanghe J, Genung LB, Mench JWCellulose Acetate, in Carbohydrate Chemistry, R. L. Whistler, J. W. Green, and J. N. BeMillrer, Editors, Academin Press, New York, p 198 (1963)