Template:Francis1999
From Kolesnikov.org
Francis1999: Francis Paul. «Back-of-the-Envelope» Calculations, or: The Seven Habits of Highly Effective Astronomers / ANU Dept. of Physics. — 1999, 25th February. — 7p. (= Семь навыков высокоэффективных астрономов). http://www.mso.anu.edu.au/pfrancis/Approximations.pdf
