Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) FUJIKAWA Shuichi,Network Clock System that Ensures a High Level of Frequency Accuracy,IEICE Transactions on Communications,0916-8516,"The Institute of Electronics, Information and Communication Engineers",2015,E98.B,11,2212-2226,https://cir.nii.ac.jp/crid/1390282679351755520,https://doi.org/10.1587/transcom.e98.b.2212