References
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- Coxeter, H. S. M., & Greitzer, S. L. (1967). Geometry revisited. Math. Assoc. of America.
- Mitrinović, D. S., Pecaric, J. E., & Volenec, V. (1989). Recent advances in geometric inequalities. Kluwer.
- Rigby, J. F. (1972). Inequalities concerning the areas obtained when one triangle is inscribed in another. Mathematics Magazine, 45(3), 113–116. https://doi.org/10.1080/0025570X.1972.11976209
- Routh, E. J. (1909). A treatise on analytical statics with numerous examples, Vol. 1 (2nd ed.). Cambridge University Press. http://www.archive.org/details/texts.