C. V.  Ramana, Induvadana, B., Srinivas, B., Yadagiri, K., Deshmukh, M. N., and Gonnade, R. G., ?Influence of electronic factors on pd-mediated cycloisomerization: a systematic investigation of competitive 6-exo-dig versus 7-endo-dig cyclizations of sugar alkynols?, Tetrahedron, vol. 65, no. 47, pp. 9819-9832, 2009.