1. 3. J. Korsgaard : The indoor environment and house-dust mites . Investigations concerning the importance of the indoor environment in asthma. Thesis , Arhus1984 .
2. 5. F. Th. M. Spieksma : The house-dust mite Dermatophagoides pteronyssinus (Trouessart 1897) . Producer of the house-dust allergen. Thesis , Leiden1967 .