F. Colombo, M. E. Luna-Elizarrarás, I. Sabadini, M. Shapiro, D. C. Struppa, “A quaternionic treatment of the inhomogeneous $\operatorname{div}$-$\operatorname{rot}$ system”, Mosc. Math. J., 12:1 (2012), 37–48
C. A. Berenstein, D. C. Struppa, “Complex analysis and convolution equations”, Itogi Nauki i Tekhniki. Ser. Sovrem. Probl. Mat. Fund. Napr., 54 (1989), 5–111
