@article{article4e5cb68c,
title   = {Phase-Locked Loop design applied to frequency-modulated atomic force microscope},
author = {Bueno, Átila Madureira and Balthazar, José Manoel and Piqueira, José Roberto Castilho},
year = {2011},
doi = {10.1016/j.cnsns.2010.12.018},
journal   = {Commun nonlinear sci numer simulat}
}