The population is subject to periodic fluctuations with population surges being followed by population troughs.

Essentially, he argues that capitalist societies are prone to periodic fluctuations in profitability.

Some satellites (including space junk) appear to blink or have a periodic fluctuation in brightness because they are rotating.

Despite periodic fluctuations, populations remain roughly the same size (fact).

A mechanism that may account for periodic fluctuations in solar luminosity has also been proposed as an explanation.

This book was to influence Charles Elton to study the periodic fluctuations in animal populations.

Observers slowly came to recognize a class of stars that undergo long-term periodic fluctuations in luminosity.

The continuous spectrum of the last diagram indicates that periodic fluctuations have been replaced by chaotic ones.

On the perception of periodic sound fluctuations (roughness).

The scientists found an extremely periodic fluctuation in the strength of the Sun's polar magnetic field.