Raquel M. Souza, Fabiano S. Oliveira, and Paulo E. D. Pinto. 2018.
 An Upper Bound for the Complexity of ShellSort. In <em>Proceedings of the 3rd Theory of Computation Meeting</em>, July 26, 2018, Natal, Brasil. SBC, Porto Alegre, Brasil, 29-32. DOI: <a href="https://doi.org/10.5753/etc.2018.3144">https://doi.org/10.5753/etc.2018.3144</a>.