1. Antonuccio, F.: Semi-Complex Analysis and Mathematical Physics (2008).
http://arxiv.org/pdf/gr-qc/9311032
2. Bronstein, M., Petkovšek, M.: On ore rings. On ore rings, linear operators and factorisation 1, 27–44 (1994)
3. Cabada, A., Tojo, F.A.F.: Comparison results for first order linear operators with reflection and periodic boundary value conditions. Nonlinear Analysis: Theory, Methods and Applications 78, 32–46 (2013)
4. Cabada, A., Tojo, F.A.F.: Solutions of the first order linear equation with reflection and general linear conditions. Glob. J. Math. Sci. 2(1), 1–8 (2013)
5. Cabada, A., Tojo, F.A.F.: Existence results for a linear equation with reflection, non-constant coefficient and periodic boundary conditions. J. Math. Anal. Appl. 412(1), 529–546 (2013)