10-point boldface incl. period. After the abstract allow one blank line. Then make an 8.5 cm long line and allow 2 more blank lines. 1 blank line and then the text of the first paragraph flush left 10-points with 2 points between lines. Allow 2 blank lines after the introduction.
All section headings incl.
The text of the first paragraph begins flush left on a new line. Allow 2 blank lines after each section to the heading of the following one. Mathematical Symbols and Formulae. All characters should be typed. Avoid confusion between similar looking symbols, letters and numbers or Greek and Roman letters.