title: [Effect of harmful chemical air impurities on some parameters of the oral cavity].
abstract: The paper describes guidelines for studying the role of harmful chemical air impurities at work in the development of diseases of the teeth and periodontium, by applying the nonparametric methods that can substantiate conclusions on the nature and mechanism of a cause-and-effect relation when the number of observations is limited.
authors: D F
authors: DF
authors: Agaeva