00324nam a2200121Ia 4500082002500000100001800025245006400043260003400107300001000141490004100151500000500192700000500197  a519.5024574bW237.DT  aWaltman, Paul  aDeterministic threshold models in the theory of epidemicsb  aBerlinbSpringer-Verlagc1974  a101p.  aLecture notes in Biomathematics v 1  a  a