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Ornat-skii, P.P., Skripnik, Y.A. & Suvid, N.F. Methods and devices for an accurate indication of a 90° phase shift. Meas Tech 3, 673–679 (1960). https://doi.org/10.1007/BF00975735
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DOI: https://doi.org/10.1007/BF00975735