van Lamoen, Floor
Friendship among triangle centers, 1 (2001) 1--6.
(with A. P. Hatzipolakis, B. Wolk, and P. Yiu) Concurrency of four Euler lines, 1 (2001) 59--68.
(with K. Dean) Geometric construction of reciprocal conjugations, 1 (2001) 115--120.
(with P. Yiu) The Kiepert pencil of Kiepert hyperbolas, 1 (2001) 125;--132.
P_ell-perpendicularity, 1 (2001) 151--160.
Some concurrencies from Tucker hexagons, 2 (2002) 5--13.
Equilateral chordal triangles, 2 (2002) 33--37.
(with J.-P. Ehrmann) The Stammler circles, 2 (2002) 151--161.
(with J.-P. Ehrmann) Some similarities associated with pedals, 2 (2002) 163--166.
Napoleon triangles and Kiepert perspectors, 3 (2003) 65--71.
(with N. Dergiades) Rectangles attached to the sides of a triangle, 3 (2003) 145--159.
(with B. Gibert) The parasix configuration and orthocorrespondence, 3 (2003) 169--180.
Circumrhombi, 3 (2003) 215--223.
Inscribed squares, 4 (2004) 207--214.
(with J.-P. Ehrmann) A projective generalization of the Droz-Farny line theorem, 4 (2004) 225--227.
(with A. Goddijn) Triangle-conic porism, 5 (2005) 57--61.
Archimedean adventures, 6 (2006) 79--96.
Square wreaths around hexagons, 6 (2006) 311--325.
(with E. Danneels) Midcircles and the arbelos, 7 (2007) 53--65.
Some more Powerian pairs in the arbelos, 7 (2007) 111--113.
(with P. Yiu) Construction of Malfatti squares, 8 (2008) 49--59.
A spatial view of the second Lemoine circle, 11 (2011) 201--203.
The spheres tangent externally to the tritangent spheres of a triangle, 12 (2012) 215--218.
Jigsawing a quadrangle from a triangle, 13 (2013) 149--152.
A special point in the arbelos leading to a pair of Archimedean circles, 1 (2001) 253--254.
Lang, Fred
Geometry and group structures of some cubics, 2 (2002) 135--146.
Langer, Joel C.
(with D. A. Singer) The lemniscatic chessboard, 11 (2011) 183--199.
Le, Anh Dung
(with M. Rolinek) The Miquel points, pseudocircumcenter, and Euler-Poncelet point of a complete quadrilateral, 14 (2014) 145--153.
Lee, Hojoo
Another proof of the Erdos-Mordell theorem, 1 (2001) 7--8.
Lee, Junghyun
(with C. W. Bae and M. Y. Hwang) Some loci in the animation of a Sangaku diagram, 16 (2016) 187--191.
Lefkaditis, George E.
(with S. Markatis and T. Toulias) On the circumscribing ellipse of three concentric ellipses, 17 (2017) 527--547.
Leitenberger, Frank
Iterated harmonic divisions and the golden ratio, 16 (2016) 429--430.
Letrouit, Cyril
On a new generalization of the Droz-Farny line, 16 (2016) 367--369.
Levelut, Alain
A note on the Hervey point of a complete quadrilateral, 11 (2011) 1 --7.
Liebscher, Dierck-E.
(with S. Liebscher) The relativity of conics and circles, 18 (2018) 1 --6.
Liebscher, Stefan
(with D.-E. Liebscher) The relativity of conics and circles, 18 (2018) 1 --6.
Lim, Sung Hyun
(with N. Dergiades and F. J. Garcia Capitan) On six circumcenters and their concyclicity, 11 (2011) 269--275.
(with N. Dergiades) The butterfly theorem revisited, 12 (2012) 301--304.
Liu, Shao-Cheng
A generalization of Thebault's theorem on the concurrency of three Euler lines, 8 (2008) 205--208.
The symmedian point and concurrent antiparallel images, 9 (2009) 149--154.
Trilinear polars and antiparallels, 9 (2009) 283--290.
On two triads of triangles associated with the perpendicular bisectors of the sides of a triangle, 14 (2014) 349--368.
Lucca, Giovanni
Three Pappus chains inside the arbelos: some identitites, 7 (2007) 107--109.
Some identities arising from inversion of Pappus chains in an arbelos, 8 (2008) 171--174.
Circle chains inside a circular segment, 9 (2009) 173--179.
Generalized Fibonacci circle chains, 10 (2010) 131--133.
Circle chains inscribed in symmetrical lenses and integer sequences, 16 (2016) 421--428.
Circle chains inscribed in symmetrical lunes and integer sequences, 17 (2017) 21--29.
Chains of tangent circles inscribed in a triangle, 17 (2017) 41--44.
Integer sequences and circle chains inside a circular segment, 18 (2018) 47--55.
Lucero, Jorge C.
On the elementary single-fold operations of Origami: Reflections and incidence constraints on the plane, 17 (2017) 207--221.