"One tength of a bel, a logarithmic unit used to compare two levels of power." 
"Two powers P1 and P2 are said to be separated by an interval of n bels (or 10n decibels) when n=log10(P1/P2). The unit is dimensionless." 
- . Arthropod Bioacoustics: Neurobiology and Behaviour. Ithaca, New York: Comstock; 1989.
- . Glossarial Index. Acoustic Behavior of Animals. Acoustic Behavior of Animals. Elsevier; 1963.
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