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A. M. A.  Shumaila, Puranik, V. G., and Kusurkar, R. S., ?Diastereoselective synthesis of 1,1,4-trisubstituted-2,3,4,9-tetrahydrospiro-beta-carbolines via glacial acetic acid catalyzed pictet - spengler reaction?, Arkivoc, pp. 41-56, 2011.\par \par A. M. A.  Shumaila, Puranik, V. G., and Kusurkar, R. S., ?Diastereoselective synthesis of tetrasubstituted-octahydro-3,6-diazacarbazoles and tetrasubstituted-3,6-diazacarbazoles via double Pictet-Spengler reaction?, Tetrahedron Letters, vol. 52, no. 21, pp. 2661-2663, 2011.\par \par }