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2. Bacteriology of expectorated sputum with quantitative culture and wash technique compared to transtracheal aspirates;Bartlett;Am. Rev. Respir. Dis.,1978
3. Microscopic and bacteriological comparison of paired sputa and transtracheal aspirates;Geckler;J. Clin. Microbiol.,1977
4. Microscopic and bacteriologic analysis of sputum;Murray,1975
5. Assessment of expectorated sputum for bacteriological analysis based on polymorphs and squamous epithelial cells: six month study;Martin;J. Clin. Microbiol.,1978