F. Neiva <em>et al.</em>"Interoperability Requirement to Enhance Collaboration in Software Product Lines: A Systematic Mapping", in <em>Anais do XIII Simpósio Brasileiro de Sistemas Colaborativos</em>, Belém, 2016, pp. 1320-1334, doi: <a href="https://doi.org/10.5753/sbsc.2016.9493">https://doi.org/10.5753/sbsc.2016.9493</a>.