Andrew D. Ker Hanno Nickau C.-H. Luke Ong Adapting innocent game models for the Böhm treelambda -theory. 333-366 2003 308 Theor. Comput. Sci. 1-3 http://dx.doi.org/10.1016/S0304-3975(02)00849-6 db/journals/tcs/tcs308.html#KerNO03