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Filter Design for Signal Processing Using MATLAB and Mathematica: Lutovac, Miroslav D, Tosic, Dejan V., Evans, Brian L.: 9780201361308: Amazon.com: Books
Butterworth filter order and cutoff frequency - MATLAB buttord
Butterworth filter - Wikipedia
Butterworth Filter Design with a Low Pass Butterworth
Digital Filter Designer's Handbook: With C++ Algorithms: Rorabaugh, C. Britton: 9780070538061: Amazon.com: Books
Butterworth Filters
High-Pass, Band-Pass and Band-Reject Filters
Understanding ECG Filtering | EMS 12 Lead
Butterworth and Chebyshev digital filters: Tables for their design: 9780444411785: Amazon.com: Books
Analog Filters for Data Conversion
Elementary Chemical Reactor Analysis: Butterworths Series in Chemical Engineering (Butterworth's Series in Chemical Engineering), Aris, Rutherford - Amazon.com
The Chebyshev and Butterworth Responses
Butterworth Filters - Developer Help
Butterworth filter - Wikipedia
Low-Pass Filters - Developer Help
MATLAB tutorial: Noise Cancellation and simple Butterworth filter design by eeprogrammer