The 6 linked references in paper V. Pylsky A., A. Yakunin G., В. Пыльский А., А. Якунин Г. (2017) “ПРОГРАММНЫЙ КОМПЛЕКС ДЛЯ РАСЧЕТА И ПРОЕКТИРОВАНИЯ АКТИВНЫХ ФИЛЬТРОВ НА ОСНОВЕ МОДЕЛИ Ε-СЛОЯ // PROGRAM COMPLEX FOR THE CALCULATION AND DESIGN OF ACTIVE FILTERS BASED ON THE E-LAYER MODEL” / spz:neicon:vestnik:y:2017:i:3:p:126-135

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  2. Wakamatsu T, Yamanashi Yu, Yoshikawa N. High-Speed Superconductive Decimation Filter for Sigma-Delta Analog to Digital Converter // Journal of Physics: Conference Series, 2017 1742-6596 Vol 87, confrence 1, 012068 doi:10.1088/1742-6596/871/1/012068.- URL: http://iopscience.iop.org/article/10.1088/17426596/871/1/012068/pdf
  3. Boustani B., Torabi S., Javaherian A., Mortazavi S.A. Ground roll attenuation using a curvelet-SVD filter: a case study from the west of Iran / J. Geophys. Eng. 2013,10 055006 doi:10.1088/1742-2132/10/5/055006 URL: http://iopscience.iop.org/article/10.1088/1742-2132/10/5/055006/pdf
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  6. Second Order Filters. URL: http://www.electronics-tutorials.ws/filter/second-order-filters.html