H. B. Lee. The Cramer-Rao bound on frequency estimates of signals closely spaced in frequency (unconditional case). IEEE Transactions on Signal Processing, 42(6):1569-1572, 1994. [doi]
@article{Lee94a-1,
title = {The Cramer-Rao bound on frequency estimates of signals closely spaced in frequency (unconditional case)},
author = {H. B. Lee},
year = {1994},
doi = {10.1109/78.286979},
url = {http://dx.doi.org/10.1109/78.286979},
researchr = {https://researchr.org/publication/Lee94a-1},
cites = {0},
citedby = {0},
journal = {IEEE Transactions on Signal Processing},
volume = {42},
number = {6},
pages = {1569-1572},
}