Brandt, John C..
The Physics and Astronomy of the Sun and Stars / - 1st ed / - New York : McGraw-Hill Book Company. - p.161 :
Mathematics
B920k6 / K6
The Physics and Astronomy of the Sun and Stars / - 1st ed / - New York : McGraw-Hill Book Company. - p.161 :
Mathematics
B920k6 / K6