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Saunders, F K., T J. Mitchell, J A. Walker, P W. Andrew, and G J. Boulnois. "Pneumolysin, the Thiol-activated Toxin of Streptococcus Pneumoniae, Does Not Require a Thiol Group for in Vitro Activity." Infect Immun 1989.

Saunders, F K., et al. "Pneumolysin, the Thiol-activated Toxin of Streptococcus Pneumoniae, Does Not Require a Thiol Group for in Vitro Activity." Infect Immun 1989.