Rocket-FFT contains code adapted from SciPy (https://scipy.org), distributed
under the BSD-3-Clause license reproduced below:

- rocket_fft/_special_math.h: a C++ port of SciPy's special functions loggamma
  (complex argument, by Josh Wilson), the polynomial evaluation it uses, and
  poch, now maintained in the xsf library (https://github.com/scipy/xsf).
- rocket_fft/_rocket_fft_numba.cpp: the fast Hankel transform (fht_coefficients,
  run_fht, rf_fhtoffset) follows scipy.fft's FFTLog implementation (by Nicolas
  Tessore, after the Fortran FFTLog code of A. J. S. Hamilton), and
  prev_good_size_complex/prev_good_size_real are adapted from SciPy's copy of
  pocketfft (prev_good_size_cmplx/prev_good_size_real).
- tests/parity/test_fftlog.py: tests adapted from SciPy's
  scipy/fft/tests/test_fftlog.py.

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