@article{article9c87df32,
title   = {All-pole phase-locked loops: calculating lock-in range by using Evan's root-locus},
author = {Piqueira, José Roberto Castilho and Monteiro, Luiz Henrique Alves},
year = {2006},
doi = {10.1080/00207170600698858},
journal   = {International Journal of Control}
}