@misc{Birch_J._G._Numerical_1892-1893,
 author={Birch, J. G.},
 volume={XXII},
 editor={Glaisher, James Whitbread Lee (1848–1928)},
 copyright={Rights Reserved - Restricted Access},
 journal={The Messenger of Mathematics},
 address={London ;},
 address={Cambridge},
 howpublished={online},
 year={1892-1893},
 publisher={Macmillan and Co.},
 language={eng},
 language={eng},
 title={Numerical factors: a theorem},
 type={Text},
}