4708
This aspect was first explored by Johan Huizinga ( in " Homo Ludens " , 1938 ) and Roger Caillois ( in " Man , Play and Games " , 1958 ) .
 person: Johan Huizinga; person: Roger Caillois
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Johan Huizinga; person: Roger Caillois