@article{GDZPPN002027402, title = {Very Slowly Varying Functions.}, journal = {Aequationes mathematicae}, volume = {10}, year = {1974}, pages = {1-9}, zbl = {0273.26001}, url = {http://dml.mathdoc.fr/item/GDZPPN002027402} }
Erdös, P.; Ash, J. Marshall; Rubel, L.A. Very Slowly Varying Functions.. Aequationes mathematicae, Tome 10 (1974) pp. 1-9. http://gdmltest.u-ga.fr/item/GDZPPN002027402/