Full reference OpenMind biblio ref
Hartner, W., and M. Schramm. 1963. “Al-Bīrūnī and the Theory of the Solar Apogee. An Example of Originality in Arabic Science”. In Scientific Change, ed. A. Crombie, 206-18. London.
{ W. Hartner, M. Schramm, A. Crombie, 1963 #11187 }