Sensitization of Purine-starved Bacteria to X-rays.

1 Although the bottleneck traveling salesman problem has not apparently been discussed before, the closely related bottleneck assignment problem has been discussed and solved by 0. Gross, "The bottleneck assignment problem," the RAND Corporation P-1630, March 6, 1959. 2 See Kruskal, J. B., "On the shortest spanning subtree of a graph and the travelling salesman problem," Proc. Amer. Math. Soc., 7, 48-50 (1956).