LITZMAN, Jiří, Tomáš FREIBERGER, Dana BARTOŇKOVÁ, Marcela VLKOVÁ, Vojtěch THON and Jindřich LOKAJ. Early manifestation and recognition of C2 complement deficiency in the form of pyogenic infection in infancy. J Paediatr Child Health. 2003, vol. 39, No 4, p. 274-277. ISSN 1034-4810.