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Pascual-Alfonso, E., Avendano, C., & Menendez, J. C. (2010). ChemInform Abstract: Improvements in the Hetero Diels-Alder Reactions of 1-Dimethylamino-1-azadienes in the Presence of an Electrophilic Scavenger Resin. ChemInform, 31(21), no–no. doi:10.1002/chin.200021136 
10.1002/chin.200021136