Lower bounds for the football pool problem for 7 and 8 matches. Haas, Wolfgang — 2007 The Electronic Journal of Combinatorics [electronic only]
On the failing cases of the Johnson bound for error-correcting codes. Haas, Wolfgang — 2008 The Electronic Journal of Combinatorics [electronic only]
On mixed codes with covering radius 1 and minimum distance 2. Haas, Wolfgang; Quistorff, Jörn — 2007 The Electronic Journal of Combinatorics [electronic only]
Lower bounds for q -ary codes with large covering radius. Haas, Wolfgang; Halupczok, Immanuel; Schlage-Puchta, Jan-Christoph — 2009 The Electronic Journal of Combinatorics [electronic only]