Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) NAKAZOE Jun and HOTTA Masao and ABE Zen-uemon,The Ultra Low Noise DC Amplifier Using Magnetic Modulator,Transactions of the Society of Instrument and Control Engineers,04534654,The Society of Instrument and Control Engineers,1979,15,4,519-525,https://cir.nii.ac.jp/crid/1390282679479296768,https://doi.org/10.9746/sicetr1965.15.519