Gary W. Howell, Nadia Diaa. Algorithm 841: BHESS: Gaussian reduction to a similar banded hessenberg form. ACM Transactions on Mathematical Software, 31(1):166-185, 2005. [doi]
@article{HowellD05,
title = {Algorithm 841: BHESS: Gaussian reduction to a similar banded hessenberg form},
author = {Gary W. Howell and Nadia Diaa},
year = {2005},
doi = {10.1145/1055531.1055539},
url = {http://doi.acm.org/10.1145/1055531.1055539},
researchr = {https://researchr.org/publication/HowellD05},
cites = {0},
citedby = {0},
journal = {ACM Transactions on Mathematical Software},
volume = {31},
number = {1},
pages = {166-185},
}