All Z4 Codes of Type II and Length 16 Are Known. - Vera Pless; Jeffrey S. Leon; Joe Fields (J. Comb. Theory A, 1997)

All Self-Dual Z4 Codes of Length 15 or Less Are Known. - Joe Fields; Philippe Gaborit; Jeffrey S. Leon; Vera Pless (IEEE Trans. Inf. Theory, 1998)

On the Classification of Extremal Even Formally Self-Dual Codes. - J. E. Fields; Philippe Gaborit; W. Cary Huffman; Vera Pless (Des. Codes Cryptogr., 1999)

On the non Z4-linearity of certain good binary codes. - Joe Fields; Philippe Gaborit (IEEE Trans. Inf. Theory, 1999)

On the classification of extremal even formally self-dual codes of lengths 20 and 22. - J. E. Fields; Philippe Gaborit; W. Cary Huffman; Vera Pless (Discret. Appl. Math., 2001)