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Military strategist and former physicist Herman Kahn , in the book " On Thermonuclear War " ( 1960 ) , used the theoretical example of a " doomsday machine " to illustrate the limitations of MAD , which was developed by John von Neumann .
 person: Herman Kahn; media: On Thermonuclear War; person: John von Neumann
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
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Text: {0} 
Answer:
 person: Herman Kahn; media: On Thermonuclear War; person: John von Neumann