There is no ternary [28, 6, 16] code. - Noboru Hamada; Tor Helleseth; Halvard Martinsen; Øyvind Ytrehus (IEEE Trans. Inf. Theory, 2000)

A New Family of Ternary Sequences with Ideal Two-level Autocorrelation Function. - Tor Helleseth; P. Vijay Kumar; Halvard Martinsen (Des. Codes Cryptogr., 2001)

Almost difference sets and their sequences with optimal autocorrelation. - K. T. Arasu 001; Cunsheng Ding; Tor Helleseth; P. Vijay Kumar; Halvard Martinsen (IEEE Trans. Inf. Theory, 2001)

New families of binary sequences with optimal three-level autocorrelation. - Cunsheng Ding; Tor Helleseth; Halvard Martinsen (IEEE Trans. Inf. Theory, 2001)

Ternary m-sequences with three-valued cross-correlation function: New decimations of Welch and Niho type. - Hans Dobbertin; Tor Helleseth; P. Vijay Kumar; Halvard Martinsen (IEEE Trans. Inf. Theory, 2001)