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5. Evaluation of Hemophilus type B systemic isolates for beta-lactamase and non-beta-lactamase mediated ampicillin resistance and for susceptibility to other antimicrobial agents. Woolfrey BF, Lally RT, Ederer MN. Am J Clin Pathol; 1987 Sep; 88(3):361-5. PubMed ID: 3498359 [Abstract] [Full Text] [Related]
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14. Detection of ampicillin resistant Haemophilus influenzae in United Kingdom laboratories. Powell M, Williams JD. J Clin Pathol; 1988 Jul; 41(7):716-9. PubMed ID: 3045158 [Abstract] [Full Text] [Related]
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16. Iodometric spot test for detection of beta-lactamase in Haemophilus influenzae. Lee WS, Komarmy L. J Clin Microbiol; 1981 Jan; 13(1):224-5. PubMed ID: 7007425 [Abstract] [Full Text] [Related]