Michail M. Konstantinov, Petko Hr. Petkov, Nikolai D. Christov. Invariants and canonical forms for linear multivariable systems under the action of orthogonal transformation groups. Kybernetika, 17(5):413-424, 1981. [doi]
@article{KonstantinovPC81,
title = {Invariants and canonical forms for linear multivariable systems under the action of orthogonal transformation groups},
author = {Michail M. Konstantinov and Petko Hr. Petkov and Nikolai D. Christov},
year = {1981},
url = {http://www.kybernetika.cz/content/1981/5/413},
researchr = {https://researchr.org/publication/KonstantinovPC81},
cites = {0},
citedby = {0},
journal = {Kybernetika},
volume = {17},
number = {5},
pages = {413-424},
}