1. Morrison WW: The interrelationship between nasal obstruction and oral deformities. The action of obstructed nasal breathing upon the mouth and the facial structures; an historical review. Int J Orthodont 17:453–458, 1931
2. Editorial: The mouth breather. Br Med J 1109, 1957
3. Duke WW: Asthma, Hay Fever, Urticaria and Allied Manifestations of Allergy. St. Louis, Mosby, 1926
4. Bowen R: Dental and palate deformities due to perennial nasal allergy in childhood. Balyeat-Bowen Hay Fever and Asthma Clin Quart 8:2, 1939
5. Straub WJ: Frequency of allergy in orthodontic patients. J Am Dental Assoc 31:334–342, 1944