Classification of generalized Hadamard matrices H ( 6 , 3 ) and quaternary Hermitian self-dual codes of length 18. Harada, Masaaki; Lam, Clement; Munemasa, Akihiro; Tonchev, Vladimir D. — 2010 The Electronic Journal of Combinatorics [electronic only]
A Characterization of Designs Related to the Witt System S(5, 8, 24). Vladimir D. Tonchev — 1986 Mathematische Zeitschrift