Herbert J. Carlin, Pier Paolo Civalleri. On darlington's realization of matrix-valued non-rational functions and the impossibility of selective flat gain. I. J. Circuit Theory and Applications, 21(4):415-420, 1993. [doi]
@article{CarlinC93,
title = {On darlington's realization of matrix-valued non-rational functions and the impossibility of selective flat gain},
author = {Herbert J. Carlin and Pier Paolo Civalleri},
year = {1993},
doi = {10.1002/cta.4490210410},
url = {https://doi.org/10.1002/cta.4490210410},
researchr = {https://researchr.org/publication/CarlinC93},
cites = {0},
citedby = {0},
journal = {I. J. Circuit Theory and Applications},
volume = {21},
number = {4},
pages = {415-420},
}