Baak, M. (1993) “An Unexpected Tandem Reaction between N-Butadienyl-N-alkylketene N,O-Trimethylsilylacetals of Propionamide and Activated Dienophiles like N-Phenyl-maleimide or Acryloyl Chloride”, CHIMIA, 47(6), p. 233. doi: 10.2533/chimia.1993.233.