Provide a list of such abbreviations, with their definitions. Define variables at first use. Use subscripts for modifiers, reserving superscripts for powers. For variable naming, consistent mathematical style is preferred to ad hoc or language-specific computer style. Avoid redefining standard variable names, such as t for time or T for temperature, to ad hoc meanings unique to your paper.
Report dates with the day first, then the month, and the year last.
Type text and tables double-spaced, with line numbering, on good paper of standard size. If an appendix is needed, it comes before the references. After acceptance, submit the final revision of both text and tables on a disk, along with a fresh printout. WordPerfect is the preferred format. If you use other software, submit both the original file and a WordPerfect version created by your software.