J. Chem. Soc., Perkin Trans. 1, 2000, (7), 1045 - 1075 (https://www.thevespiary.org/rhodium/Rhodium/pdf/indole.synth.review.1994-99.pdf)
(https://www.thevespiary.org/rhodium/Rhodium/pdf/indole.synth.review.1994-99.pdf)10.1039/a909834h (http://dx.doi.org/10.1039/a909834h)
http://www.scripps.edu/chem/baran/images/grpmtgpdf/Richter_Sep_04.pdf (http://www.scripps.edu/chem/baran/images/grpmtgpdf/Richter_Sep_04.pdf)
Phil S. Baran (http://www.scripps.edu/chem/baran/html/home.html)
(http://www.scripps.edu/chem/baran/html/home.html)(https://www.thevespiary.org/rhodium/Rhodium/hive/hiveboard/picproxie_imgs/pdf.gif)