Radioimmunoassay of thyroxine (T4), 3,5,3′-triiodothyronine (T3), 3,3′,5′-triiodothyronine (reverse T3, rT3), and 3,3′-diiodothyronine (T2). - Wiersinga,W.M.; Chopra,I.J. (Methods Enzymol, 1982)