_norm_factor(p, k)
:None:None:`p` is an array_like of polynomial poles :None:None:`k` is a float gain
First 10 values are listed in "Bessel Scale Factors" table, "Bessel Filters Polynomials, Poles and Circuit Elements 2003, C. Bond."
Numerically find frequency shift to apply to delay-normalized filter such that -3 dB point is at 1 rad/sec.
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