G. J. Raatjes

Growth and toxin formation by Clostridium botulinum at low pH values.

J. Smelt, C. T. Verrips, J. Crowther, 1982, The Journal of applied bacteriology.

Clostridium botulinum can grow and form toxin at pH values lower than 4.6

J. Smelt, G. J. Raatjes, 1979, Nature.