Jintai Ding Jason E. Gower Dieter Schmidt Christopher Wolf Zhijun Yin Complexity Estimates for the F<sub>4</sub> Attack on the Perturbed Matsumoto-Imai Cryptosystem. 262-277 2005 conf/ima/2005 IMA Int. Conf. http://dx.doi.org/10.1007/11586821_18 db/conf/ima/ima2005.html#DingGSWY05