@article{article37595322,
title   = {A Feedback System Dynamic Response Analysis by Root-Locus Method Using Excel Spreadsheet and XNumbers Add-In Package},
author = {Mirapalheta, Gustavo C and Penedo, Sergio Ricardo Master and Justo Filho, João Francisco},
year = {2013},
doi = {10.7227/IJEEE.50.1.6},
journal   = {International Journal of Electrical Engineering Education}
}