Daniel J. Dougherty Silvia Ghilezan Pierre Lescanne Characterizing strong normalization in the Curien-Herbelin symmetric lambda calculus: Extending the Coppo-Dezani heritage. 114-128 2008 398 Theor. Comput. Sci. 1-3 http://dx.doi.org/10.1016/j.tcs.2008.01.022 db/journals/tcs/tcs398.html#DoughertyGL08