@article{10_4153_CJM_1988_003_7,
     author = {Berman, Robert D.},
     title = {Generalized {Variation} and {Functions} of {Slow} {Growth}},
     journal = {Canadian journal of mathematics},
     pages = {55--85},
     year = {1988},
     volume = {40},
     number = {1},
     doi = {10.4153/CJM-1988-003-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1988-003-7/}
}