1. Agresti A (1990): Categorical Data Analysis. New York, NY: Wiley
2. Case study;Allen;J Am Acad Child Adolesc Psychiatry,1995
3. Viral infections trigger multiple sclerosis relapses;Andersen;J Neurol,1993
4. Specificity of persistence of antibody to the streptococcal group A carbohydrate in rheumatic valvular heart disease;Appleton;J Lab Clin Med,1985
5. Ayoub E, Harden E (1992): Immune response to streptococcal antigens: Diagnostic methods. In: Rose N, editor. Manual of Clinical Laboratory Immunology, 4th ed. Washington, DC: American Society of Microbiology, 427–434