Decock, CJC., Dekeyser, JL., Poupaert, J., & Dumont, P. (1987). Anomalous Reactivity of Methylidenemalonates in the Prilezhaev Reaction - Evidence for a 1,3-dipolar Mechanism. Societes Chimiques Belges. Bulletin, 96(10), 783-786. https://doi.org/10.1002/bscb.19870961009 (Original work published 1987)