Yrjölä, Heikki, Timo Silvennoinen, Eero Vilppula, and Eva Ahlström-Bengs. 1988. “Intravenous Indomethacin for Postoperative Pain A Double-Blind Study of Ankle Surgery”. Acta Orthopaedica 59 (1):43-45. https://doi.org/10.3109/17453678809149342.