[Studies on parallel child groups with consideration of air hygiene aspects].
D000397:Air Pollution; D002648:Child; D002662:Child Health Services; D004787:Environmental Pollution; D006801:Humans; D011634:Public Health; D012494:Sampling Studies; D012572:School Health Services; D012924:Social Conditions
Ein Beitrag zur Methodik der untersuchung von Kinderparallelgruppen unter lufthygienischen Aspekten.