The metric system of units should be used throughout. As there is no difference in size, special attention should be given to the placing of indices and exponents so that they are recognizable as such. Equations should be numbered sequentially with arabic numerals in parentheses on the right-hand side of the page. Letters in formulae are normally printed in italics, figures in ordinary typeface. All references cited in the text, but only these, are to be listed at the end of the paper in alphabetical order under the first author's name.
Chronological order is used for more than one work by the same author or team of authors.
Works by two authors should also be listed alphabetically according to the second author's name. Perturbation effects on stability of gravity receptors. Inhibitory interactions in the retina of Limulus. Introduction to the fine structure of plant cells. Springer, Berlin Heidelberg New York Citations in the text should be by author and date in parentheses.