Nee, G., Bottinstrzalko, T., Seydenpenne, J., Beaujean, M., & Viehe, H. (1983). Hmpa Dehydro Dimer - a Remarkable Complexing Agent of Lithium Cation. The Journal of Organic Chemistry, 48(7), 1111-1114. https://doi.org/10.1021/jo00155a041 (Original work published 1983)