Ferguson, Joel, Sakata, Naoki, Fujimoto, Kenji. Institute of Electrical and Electronics Engineers (IEEE); 2024. Input-to-State Stable Hybrid Momentum Observer for Mechanical Systems.

Fujimoto, Kenji, Sakata, Naoki, Maruta, Ichiro, Ferguson, Joel. Institute of Electrical and Electronics Engineers (IEEE); 2021. A passivity based sliding mode controller for simple port-hamiltonian systems.