Tensors may be set bold nonitalic if it is necessary to distinguish them from vectors. Subscripts and superscripts will be aligned unless an order of subscripts and superscripts is explicitly requested by the author in a note accompanying the manuscript. In displayed equations, fractions are limited to two levels. Displayed equations should be centered. If equations are numbered, they should appear in serial order, with the numbers appearing on the right.
Equations are to be read and punctuated as sentences or parts of sentences.
There is no comma before the date. Papers by more than three authors should be cited by giving the last name of the first author followed by et al. Parentheses around the date are omitted for references appearing in a table or in a note to a table. All sources cited in the text and tables must appear in the reference list at the end of the paper, and all entries in the reference list must be cited in the text. For papers with more than eight authors, the last name and initials of the first author only should be listed, followed by a comma and et al.