Björnsson , E., Hjelm , E., Janson , C., Fridell , E. and Boman , G. 1996. Serology of Respiratory Viruses in Relation to Asthma and Bronchial Hyperresponsiveness. Upsala Journal of Medical Sciences. 101, 2 (Jul. 1996), 159-168. DOI:https://doi.org/10.3109/03009739609178920.