A. Luiz, C. Campos, and R. Richter.
" Some families of 0-rotatable graceful caterpillars", in <em>Anais do I Encontro de Teoria da Computação</em>, Porto Alegre, 2016, pp. 812-815, doi: <a href="https://doi.org/10.5753/etc.2016.9831">https://doi.org/10.5753/etc.2016.9831</a>.