Kotter, R., U. Dettmar, U.K. Sorger, On the Construction of Trellis Codes based on (p)UM Codes over Z/sub 4/, Problems of Information Transmission, 31(2), pp. 154-161, April 1995.

Abstract:
The construction of some binary trellis (partial) unit memory ((P)UM) codes based on codes over the ring Z/sub 4/ is proposed. Estimates of the distance properties of these codes are obtained.