Zuniga-Galindo W.A., “The Cauchy Problem For Non-Archimedean Pseudodifferential Equations of Klein-Gordon Type”, J. Math. Anal. Appl., 420:2 (2014), 1033–1050
O. F. Casas-Sánchez, W. A. Zúñiga-Galindo, “p-Adic elliptic quadratic forms, parabolic-type pseudodifferential equations with variable coefficients and Markov processes”, P-Adic Num Ultrametr Anal Appl, 6:1 (2014), 1
Chacon-Cortes L.F., Zuniga-Galindo W.A., “Nonlocal Operators, Parabolic-Type Equations, and Ultrametric Random Walks”, J. Math. Phys., 54:11 (2013), 113503
С. В. Козырев, “Методы и приложения ультраметрического и $p$-адического анализа: от теории всплесков до биофизики”, Совр. пробл. матем., 12, МИАН, М., 2008, 3–168 ; S. V. Kozyrev, “Methods and Applications of Ultrametric and $p$-Adic Analysis: From Wavelet Theory to Biophysics”, Proc. Steklov Inst. Math., 274, suppl. 1 (2011), S1–S84