Anatomists and histologists, among many other biologists, often find that a given variable studied by them undergoes changes with time; they are dealing with a so-called time function, a term that implies merely that a given value depends, at least in part, upon the time when it is sampled.
CITATION STYLE
Halberg, F., Tong, Y. L., & Johnson, E. A. (1967). Circadian System Phase — An Aspect of Temporal Morphology; Procedures and Illustrative Examples. In The Cellular Aspects of Biorhythms (pp. 20–48). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-642-88394-1_2
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