These Fourier routines were originally based on the Fourier
routines of the same names from the NETLIB bihar and fftpack
fortran libraries developed by Paul N. Swarztrauber at the National
Center for Atmospheric Research in Boulder, CO USA. They have been
reimplemented in C and optimized in a few ways for OggSquish.
PhD research, you have already
made a decision that will have a major impact on the success of your
project, and perhaps even on your future career. You have chosen to
work in a particular research group, under the guidance of a particular
thesis advisor or supervisor.