1. O-regularly varying functions;Aljančić;Publ. Inst. Math. (Beograd),1977
2. O-regularly variation and uniform convergence;Arandjelović;Publ. Inst. Math. (Beograd),1990
3. Über einen O-inversionssatz;Avakumović;Bull. Int. Acad. Youg. Sci.,1936
4. Regular Variation;Bingham,1987
5. Slowly varying functions and asymptotic relations;Bojanić;J. Math. Anal. Appl.,1971