R-Schauder decompositions. Some applications. P. Galindo, M. Maestre, P. Rueda (1997) Extracta Mathematicae
RUC systems in rearrangement invariant spaces P. G. Dodds, E. M. Semenov, F. A. Sukochev (2002) Studia Mathematica We present necessary and sufficient conditions for a rearrangement invariant function space to have a complete orthonormal uniformly bounded RUC system.
R(X) as a Dirichlet Algebra and Representation of Orthogonal Measures by Differentials. Bernt Oksendal (1971) Mathematica Scandinavica