Brasil, Silvania Rizzi, et al. “Unexpected Formation of Bis(hydrazinecarboximidamide) via Ultrasound Promoted Rearrangement of Epoxy Ketone”. Orbital: The Electronic Journal of Chemistry, vol. 9, no. 3, July 2017, pp. 204-9, https://periodicos.ufms.br/index.php/orbital/article/view/16499.