De Lombaert, S., Nemery, I., Roekens, B., Carretero, J. C., Kimmel, T., & Ghosez, L. (1986). Methyl 3-phenylsulfonyl Orthopropionate - a New Reagent for Cyclopentannulation. Tetrahedron Letters, 27(42), 5099-5102. https://doi.org/10.1016/S0040-4039(00)85143-6 (Original work published 1986)