RT Journal Article SR Electronic T1 On electrical oscillations of low frequency and their resonance JF American Journal of Science JO Am J Sci FD American Journal of Science SP 420 OP 429 DO 10.2475/ajs.s3-45.269.420 VO s3-45 IS 269 A1 Pupin, M. I. YR 1893 UL http://www.ajsonline.org/content/s3-45/269/420.abstract AB