On the extended error-correcting capabilities of the quaternary Preparata codes
Marcus Greferath, U. Vellbinger · IEEE Transactions on Information Theory · 1998
We prove extended error-correcting capabilities of the quaternary Preparata codes. These are metrically reflected by a slight and simple modification of the Lee distance on Z/sub 4/: we change the weight of the element 2 to 4/3 and leave all remaining weights untouched.