A multigrid scheme for solving convection-diffusion-integral optimal control problems. - Duncan Kioi Gathungu; Alfio Borzì (Comput. Vis. Sci., 2019)

Hierarchical-matrix method for a class of diffusion-dominated partial integro-differential equations. - Duncan Kioi Gathungu; Mario Bebendorf; Alfio Borzì (Numer. Linear Algebra Appl., 2022)

A Novel Multivariate Spectral Local Quasilinearization Method (MV-SLQLM) for Modelling Flow, Moisture, Heat, and Solute Transport in Soil. - Elias Mwakilama; Vusi Magagula; Duncan Kioi Gathungu (J. Appl. Math., 2023)

Transmission Dynamics of Monkeypox Virus With Age-Structured Human Population: A Mathematical Modeling Approach. - Walter Okongo; Jeconia Abonyo Okelo; Duncan Kioi Gathungu; Stephen Edward Moore; Nnaemeka Stanley Aguegboh (J. Appl. Math., 2024)

A Coinfection Model of Leptospirosis and Melioidosis With Optimal Control. - Habtamu Ayalew Engida; David Mwangi Theuri; Duncan Kioi Gathungu; John Gachohi; Haileyesus Tessema Alemneh (J. Appl. Math., 2025)