@article{weko_5405_1,
   author	 = "ITO,Koichi and OHTSUKI,Hisashi and YAMAUCHI,Atsushi",
   title	 = "Relationship between aggregation of rewards and the possibility of polymorphism in continuous snowdrift games.",
   journal	 = "Journal of theoretical biology",
   year 	 = "2015",
   volume	 = "372",
   number	 = "",
   pages	 = "47--53",
   month	 = "may"
}