@article{oai:ynu.repo.nii.ac.jp:00008712,
 author = {Konno, Norio and Machida, Takuya and Wakasa, Tohru},
 journal = {Yokohama Mathematical Journal},
 month = {},
 pages = {53--63},
 title = {The Heun differential equation and the Gauss differential equation related to quantum walks},
 volume = {58},
 year = {2012}
}