@article{3b29199f4e1742358dcad2808693fd4c,
title = "Preface",
author = "Kazuhiro Ishige and Tohru Ozawa and Senjo Shimizu and Yasushi Taniuchi",
note = "Funding Information: From September 1988 to July 1990 and from March 1996 to July 1996, he received a grant from the Alexander von Humboldt Foundation and carried out research visits to University of Paderborn. Since those visits, he has maintained close friendships and research collaborations with many German researchers, especially with Reinhard Farwig and Hermann Sohr. ",
year = "2022",
month = aug,
doi = "10.1007/s42985-022-00184-1",
language = "English",
volume = "3",
journal = "Partial Differential Equations and Applications",
issn = "2662-2963",
publisher = "Springer International Publishing AG",
number = "4",
}