Covacic, Márcio Roberto, Marcelo Carvalho Minhoto Teixeira, and Edvaldo Assunção. 2008. “Stability Analysis of Uncertain Systems through Routh’s Criterion”. Semina: Ciências Exatas E Tecnológicas 29 (2):119-28. https://doi.org/10.5433/1679-0375.2008v29n2p119.