Evolving MIMO multi-layered artificial neural networks using grammatical evolution. - Qadeer Ahmad; Atif Rafiq; Muhammad Adil Raja; Noman Javed (SAC, 2019)

Pyramid: A Hierarchical Approach to Scaling Down Population Size in Genetic Algorithms. - Conor Ryan; Atif Rafiq; Enrique Naredo (CEC, 2020)

Pyramid-Z: Evolving Hierarchical Specialists in Genetic Algorithms. - Atif Rafiq; Enrique Naredo; Meghana Kshirsagar 002; Conor Ryan (IJCCI, 2021)

On the effect of embedding hierarchy within multi-objective optimization for evolving symbolic regression models. - Atif Rafiq; Enrique Naredo; Meghana Kshirsagar 002; Conor Ryan (GECCO Companion, 2022)