L. H. Ferry, D. Williamson. Optimal minimal order N-State estimators for linear stochastic systems. Automatica, 12(4):365-369, 1976. [doi]
@article{FerryW76,
title = {Optimal minimal order N-State estimators for linear stochastic systems},
author = {L. H. Ferry and D. Williamson},
year = {1976},
doi = {10.1016/0005-1098(76)90056-X},
url = {http://dx.doi.org/10.1016/0005-1098(76)90056-X},
researchr = {https://researchr.org/publication/FerryW76},
cites = {0},
citedby = {0},
journal = {Automatica},
volume = {12},
number = {4},
pages = {365-369},
}