@book{ BB27293046, author = "Graef, John R. and Henderson, Johnny and Ouahab, Abdelghani", title = "Topological methods for differential equations and inclusions", publisher = "CRC Press", year = "2019", series = "Monographs and research notes in mathematics", number = "", URL = "https://ci.nii.ac.jp/ncid/BB27293046" }