G. W. Stewart. Algorithm 506: HQR3 and EXCHNG: Fortran Subroutines for Calculating and Ordering the Eigenvalues of a Real Upper Hessenberg Matrix [F2]. ACM Transactions on Mathematical Software, 2(3):275-280, 1976. [doi]
@article{Stewart76:0,
title = {Algorithm 506: HQR3 and EXCHNG: Fortran Subroutines for Calculating and Ordering the Eigenvalues of a Real Upper Hessenberg Matrix [F2]},
author = {G. W. Stewart},
year = {1976},
doi = {10.1145/355694.355700},
url = {http://doi.acm.org/10.1145/355694.355700},
researchr = {https://researchr.org/publication/Stewart76%3A0},
cites = {0},
citedby = {0},
journal = {ACM Transactions on Mathematical Software},
volume = {2},
number = {3},
pages = {275-280},
}