Full reference OpenMind biblio ref
Al-Bīrūnī, Abū. 1998. Rasāʼiluʼl-Bīrūnī. Islamic Mathematics And Astronomy, Vol. 32. Frankfurt am Main: Institute for the History of Arabic-Islamic Science at the Johann Wolfgang Goethe University.
{ Abū Al-Bīrūnī, 1998 #10019 }