J. A. Farrell. Persistence of excitation conditions in passive learning control. Automatica, 33(4):699-703, 1997. [doi]
@article{Farrell97,
title = {Persistence of excitation conditions in passive learning control},
author = {J. A. Farrell},
year = {1997},
doi = {10.1016/S0005-1098(96)00203-8},
url = {http://dx.doi.org/10.1016/S0005-1098(96)00203-8},
researchr = {https://researchr.org/publication/Farrell97},
cites = {0},
citedby = {0},
journal = {Automatica},
volume = {33},
number = {4},
pages = {699-703},
}