Theoretical and computational aspects of quaternionic multivalued Hopfield neural networks. - Marcos Eduardo Valle; Fidelis Zanetti de Castro (IJCNN, 2016)

Continuous-Valued Quaternionic Hopfield Neural Network for Image Retrieval: A Color Space Study. - Fidelis Zanetti de Castro; Marcos Eduardo Valle (BRACIS, 2017)

On the Dynamics of Hopfield Neural Networks on Unit Quaternions. - Marcos Eduardo Valle; Fidelis Zanetti de Castro (IEEE Trans. Neural Networks Learn. Syst., 2018)

A broad class of discrete-time hypercomplex-valued Hopfield neural networks. - Fidelis Zanetti de Castro; Marcos Eduardo Valle (Neural Networks, 2020)