The documentation for YULEWALK presents a simplified high-level overview of the algorithm for the function, and refers at the bottom to the following paper:
Friedlander, B., and B. Porat, "The Modified Yule-Walker Method of ARMA Spectral Estimation," IEEE Transactions on Aerospace Electronic Systems, AES-20, No. 2 (March 1984), pp.158-173.
Looking at this paper, there are multiple variants presented, and it is not clear which one the YULEWALK function actually uses.
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