1. Aljančić, S., Arandjelović, I.D.: O-regularly varying functions. Publications de l’institut mathématique, nouvelle série 36(22), 5–22 (1977)
2. Bari, K.N., Stečkin, S.B.: Best approximations and differential properties of two conjugate functions (Russian). Trudy Moskov. Mat. Obšč 5, 483–522 (1956)
3. Beurling, A.: Analytic continuation across a linear boundary. Acta Math. 128, 153–182 (1972)
4. Bingham, N.H., Goldie, C.M., Teugels, J.L.: Regular Variation. Encyclopedia of Mathematics and its Applications. Cambridge University Press, Cambridge (1989)
5. Blasco, O.: Remarks on weighted mixed norm spaces. Topics in complex analysis and operator theory, Contemp. Math., 561, Amer. Math. Soc., Providence, RI, pp. 137–154 (2012)