1. (a) König, B. Furan. InHetarenes and Related Ring Systems;ScienceofSynthesis; Maas, G., Ed.; George Thieme Verlag: Stuttgart, 2001; Category 2, Vol. 9, pp 183−285.
2. (b) Dell, C. P. Benzo[b]furans. InHetarenes and RelatedRing Systems;ScienceofSynthesis; Thomas, E. J., Ed.; George Thieme Verlag: Stuttgart, 2000; Category 2, Vol. 10, pp 11−86.