Geodesic
A new representation of slowly varying functions
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 1 (2001), pp. 47-52

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For a slowly varying function $L(t)$ a new integral representation is obtained: $$L(t)=\eta(t)\int\limits_{t_0}^t b(x)d\ln x, t \geq t_0>0,$$ where $\eta(t)$ is measurable on $[t_0, +\infty), b(t)$ is continuous on $[t_0, + \infty)$ and $\lim\limits_{t \rightarrow + \infty} (b(t) / L(t))= 0$. This representation allows to generalize D.D. Adamovich’s classical result on equivalent slowly varying functions and to extend the statement of A. A. Goldberg theorem.
Keywords: slowly varying function, Goldberg theorem. 
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E. A. Danielyan; G. V. Mikaelyan. A new representation of slowly varying functions. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 1 (2001), pp. 47-52. http://geodesic.mathdoc.fr/item/UZERU_2001_1_a2/