Sources:

• "Expert opinion on the assesment of the Prevalence of Keratin allergy"
  (Expert assessment of the relevance of keratin allergy, Prof. Dr. med. Hoffmann, Head of the Paediatric Institute of the University Hospital of Frankfurt am Main, Germany.

• Gutachten zur Einschätzung der Relevanz der Bettfedern- (Keratin) Allergie"
  (Expert assessment of the relevance of keratin allergy, Prof. Dr. med. Hoffmann, Head of the Paediatric Institute of the University Hospital of Frankfurt am Main, Germany.

• Summary "Gutachtens zur Einschätzung der Bettfedern- (Keratin) Allergie" (Expert assessment of the relevance of keratin allergy, Prof. Dr. med. Hoffmann, Head of the Paediatric Institute of the University Hospital of Frankfurt am Main, Germany.

• House dust mite allergen in pillows",
  expert opinion of the Wellington Asthma Research Group, Wellington School of Medicine, New Zealand

• Ökologische Untersuchungen zur Hausstaubmilbenallergie"
  (Ecological studies of allergy to house dust mites), Prof. Dr. Dr. Hans W. Jürgens, Anthropological Institute of the University of Kiel, Germany

• The House Dust Mite Allergy and Down Blankets”,
  Prof. Dr. Dr. Hans W. Jürgens, Anthropological Institute of the University of Kiel, Germany

The results of research have also been published in PAS 1008, edited by DIN - Deutsches Institut für Normung (German Institute for Standardization).