@conference { conference,
title = {Quaternion Neural Networks: State-of-the-Art and Research Challenges},
author = {David García-Retuerta, Roberto Casado-Vara, Ángel Martín del Rey, Fernando de la Prieta, Javier Prieto, Juan M. Corchado},
chapter = {IDEAL (2) 2020: 456-467},
year = {2020}
}