Tetrahedron Letters, Volume 42, Number 48, 26 November 2001 , pp. 8429-8431(3)
Collini M.D., Miller C.P. A highly efficient, one-pot synthesis of benzoflluoren-10-ones. Tetrahedron letters. 2001, V 42, p. 8429-8431.
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http://dx.doi.org/10.1016/S0040-4039(01)01828-7