Sandok, P. L., Jenkin, H. M., Graves, S. R., & Knight, S. T. (1976). Retention of motility of Treponema pallidum (Nichols virulent strain) in an anaerobic cell culture system and in a cell-free system.

Sandok, P L., H M. Jenkin, S R. Graves, and S T. Knight. Retention of Motility of Treponema Pallidum (Nichols Virulent Strain) in an Anaerobic Cell Culture System and in a Cell-free System. 1976.

Sandok, P L., H M. Jenkin, S R. Graves, and S T. Knight. Retention of Motility of Treponema Pallidum (Nichols Virulent Strain) in an Anaerobic Cell Culture System and in a Cell-free System. 1976.