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    van Kempen, Huub
      On some theorems of Poncelet and Carnot, 6 (2006) 229--234.
    Kimberling, Clark
      Multiplying and dividing curves by points, 1 (2001) 99--105.
      Conics associated with a cevian nest, 1 (2001) 141--150.
      Cubics associated with triangles of equal areas, 1 (2001) 161--171.
      Collineation, conjugacies, and cubics, 2 (2002) 21--32.
      Bicentric pairs of points and related triangle centers, 3 (2003) 35--47.
      Translated triangle perspective to a reference triangle, 6 (2006) 269--284.
      Ceva collineations, 7 (2007) 67--72.
      Fixed points and fixed lines of Ceva collineations, 7 (2007) 159--168.
      Second-degree involutory symbolic substitutions, 8 (2008) 175--182.
      Mappings associated with vertex triangles, 9 (2009) 27--39.
      Trilinear distance inequalities for the symmedian point, the centroid, and other triangle centers, 10 (2010) 135--139.
      (with P. J. C. Moses) Perspective isoconjugate triangle pairs, Hofstadter pairs, and crosssums on the nine-point circle, 11 (2011) 83--93.
    Kiss, Sandor N
      The orthic-of-intouch and intouch-of-orthic triangles, 6 (2006) 171--177.
      (with P. Yiu) The touchpoints triangles and the Feuerbach hyperbolas, 14 (2014) 63--86.
      (with Z. Kovacs) Isogonal conjugacy through a fixed point theorem, 16 (2016) 171--178.
      A distance property of the Feuerbach point and its extension, 16 (2016) 283--290.
      Distances among the Feuerbach points, 16 (2016) 373--379.
      (with P. Yiu) On the Tucker circles, 17 (2017) 157--175.
    Klemm, John D.
      (with E. A. Weinstein) An improved inequality for the perimeter of a quadrilateral, 17 (2017) 97--100.
    Kobayashi, Kenta
      A recursive formula for the circumradius of the $n$-simplex, 16 (2016) 179--184.
    Konig, Joachim
      (with D. Nedrenco) Septic equations are solvable by 2-fold origami, 16 (2016) 193--205.
    Koroglu, Zeyd Yusuf
      (with M. E. Akengin and Y. Yargic) Three natural homoteties of the nine-point circle, 13 (2013) 209--218.
    Kovac, Vjekoslav
      (with H. Abraham) From electrostatic potentials to yet another triangle center, 15 (2015) 73--89.
    Kovacs, Zoltan
      (with S. N. Kiss) Isogonal conjugacy through a fixed point theorem, 16 (2016) 171--178.
    Krasopoulos, Panagiotis T.
      Kronecker theorem and a sequence of triangles, 8 (2008) 27--37.
    Krishna, Dasari Naga Vijay
      On the Feuerbach triangle, 17 (2017) 289--300.
    Kung, Sidney
      (with J. Tong) A simple construction of the golden ratio, 7 (2007) 31--32.
    Kuzmina, Anna S.
      An improvement of Birsan's inequalities for the sides of a triangle, 16 (2016) 81--84.