Gabbutt Christopher D., Heron B. Mark, Instone Alicia C., Horton Peter N., Hursthouse Michael B.:
Synthesis and photochromic properties of substituted 3H-naphtho[2,1-b]pyrans
Tetrahedron, 61 (2005) N 2, 463-471
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http://dx.doi.org/10.1016/j.tet.2004.10.069