Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI)
NAGUMO Mitio,Über die Lage der Integralkurven gewöhnlicher Differentialgleichungen,Proceedings of the Physico-Mathematical Society of Japan. 3rd Series,0370-1239,"THE PHYSICAL SOCIETY OF JAPAN , The Mathematical Society of Japan",1942,24,0,551-559,https://cir.nii.ac.jp/crid/1390282680404630528,https://doi.org/10.11429/ppmsj1919.24.0_551