1. Bart, H., Tsekanovskii, V.E., Matricial Coupling and Equivalence After Extension, Oper. Theory Adv. Appl. 59 (1992), 143–160.
2. Bastos, M.A., Santos, A.F. dos, Duduchava, R., Finite Interval Convolution Operators on the Bessel Potential Spaces H8p, Math. Nachr. 173 (1995), 49–63.
3. Castro, L.P., Wiener-Hopf Operators on Unions of Finite Intervals: Relations and Generalized Inversion, Proceedings of the Meeting on Matrix Analysis and Applications, F.J. Cobos (ed.) et al., Department of Applied Mathematics I, University of Sevilla, Sevilla (1997), 148–155.
4. Castro, L.P., A Relation Between Convolution Type Operators on Intervals in Sobolev Spaces, Appl. Anal. 74 (2000), 393–412.
5. Castro, L.P., Speck, F.-O., A Fredholm Study for a Sommerfeld Diffraction Problem, Pitman Res. Notes Math. Ser. 379 (1998), 47–51.