  In a recent paper [J.Math.Phys. vol42, 2236-2265 (2001)], we discussed
differential operators within a quaternionic formulation of quantum mechanics.
In particular, we proposed a practical method to solve quaternionic and complex
linear second order differential equations with constant coefficients. In this
paper, we extend our discussion to real linear quaternionic differential
equations. The method of resolution is based on the Jordan canonical form of
quaternionic matrices associoated to real linear differential operators.
