Beyer, W. A.; Louck, J. D. (1997), "Transfinite function iteration and surreal numbers", Advances in Applied Mathematics, 18 (3): 333–350, doi:10.1006/aama.1996.0513, MR1436485
Beyer, W. A.; Louck, J. D. (1997), "Transfinite function iteration and surreal numbers", Advances in Applied Mathematics, 18 (3): 333–350, doi:10.1006/aama.1996.0513, MR1436485