Saunders, F. K., Mitchell, T. J., Walker, J. A., Andrew, P. W., & Boulnois, G. J. (1989). Pneumolysin, the thiol-activated toxin of Streptococcus pneumoniae, does not require a thiol group for in vitro activity. Infect Immun.

Saunders, F K., T J. Mitchell, J A. Walker, P W. Andrew, và 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.