"Takao;Asano|Yusuke;Osaki|","Portfolio allocation problems between risky and ambiguous assets","Annals of Operations Research","02545330","2019/04/11","284","","63","79","isVersionOf https://doi.org/10.1007/s10479-019-03206-1","","000527867500003","https://ousar.lib.okayama-u.ac.jp/58561","10.1007/s10479-019-03206-1"