Green, S.F., Jones, M.H., Burnell, S.J. (2004). An Introduction to the Sun and Stars, Cambridge University Press, Cambridge UK, ISBN0-521-83737-5, page 21.[1]
Green, S.F., Jones, M.H., Burnell, S.J. (2004). An Introduction to the Sun and Stars, Cambridge University Press, Cambridge UK, ISBN0-521-83737-5, page 21.[1]