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Odehnal, Boris
Some triangle centers associated with the circles tangent to the excircles, 10 (2010) 35--40.

Odom, Lucy H.
(with W. G. Boskoff and B. D. Suceava) An elementary view on Gromov hyperbolic spaces, 12 (2012) 283--286.

Okumura, Hiroshi
(with M. Watanabe) The Archimedean circles of Schoch and Woo, 4 (2004) 27--34.
(with M. Watanabe) The twin circles of Archimedes in a skewed arbelos, 4 (2004) 229--251.
(with M. Watanabe) The arbelos in $n$-aliquot parts, 5 (2005) 37--45.
(with M. Watanabe) A generalization of Power's Archimedean circles, 6 (2006) 103--105.
(with M. Watanabe) Characterizations of an infinite set of Archimedean circles, 7 (2007) 121--123.
(with M. Watanabe) Remarks on Woo's Archimedean circles, 7 (2007) 125--128.
More on twin circles of the skewed arbelos, 11 (2011) 139--144.
A note on Haga's theorems in paper folding, 14 (2014) 241--242.
Archimedean circles related to the Schoch line, 14 (2014) 369--370.
Two pairs of Archimedean circles derived from a square, 16 (2016) 23--24.
A remark on the arbelos and the regular star polygon, 18 (2018) 43--44.
(with S. Saitoh) Remarks for the twin circles of Archimedes in a skewed arbelos, 18 (2018) 99--102.

Olah-Gal, Robert
(with J. Sandor) On trigonometric proofs of the Steiner-Lehmus theorem, 9 (2009) 155--160.

Oller-Marcen, Antonio M.
The f-belos, 13 (2013) 103--111.
Archimedes' arbelos to the n-dimension, 16 (2016) 51--56.

Olvera, Auturo
(with C. E. Garza and M. C. Jorge) Areas and shapes of planar irregular polygons, 18 (2018) 17--36.

Ong, Darren C.
On a theorem of intersecting conics, 11 (2011) 95--107.

Opincariu, Mihai
(with D. Marinescu, M. Monea and M. Stroe) A sequence of triangles and geometric inequalities, 9 (2009) 291--295.

Osinkin, Sergey F. On the existence of a triangle with prescribed bisector lengths, 16 (2016) 399--405.

Oxman, Victor
On the existence of triangles with given lengths of one side and two adjacent angle bisectors, 4 (2004) 215--218.
On the existence of triangles with given lengths of one side, the opposite and an adjacent angle bisectors, 5 (2005) 21--22.
On the existence of triangles with given circumcircle, incircle, and one additional element, 5 (2005) 165--171.
A purely geometric proof of the uniqueness of a triangle with prescribed angle bisectors, 8 (2008) 197--200.
(with M. Stupel) Why are the side lengths of the squares inscribed in a triangle so close to each other?, 13 (2013) 113--115.