1. Sur les équations polynomiales dans les quaternions;Beck;Enseign. Math. (2),1979
2. Polynomials with coefficients from a division ring;Bray;Canad. J. Math.,1983
3. A Cauchy kernel for slice regular functions;Colombo;Ann. Global Anal. Geom.,2010
4. Extension results for slice regular functions of a quaternionic variable;Colombo;Adv. Math.,2009
5. A structure formula for slice monogenic functions and some of its consequences;Colombo,2009