67. Benjamin Warren. Generalization of the Ellipse Formed by Six Circumcenters of a Triangle Vertex, the Cevian Point, and the Circumcevian triangle, pp. 437-440..pdf
Volume 9 Paper 67
66. Benjamin Warren. Tangents Through Four Points on a Conic Section, pp. 425-436..pdf
Volume 9 Paper 66
65. Benjamin Warren. The Circumcenters of the Two Triangles and Two Similar Rectangles Joined at a Vertex are Concyclic, pp. 422-424..pdf
Volume 9 Paper 65
64. Benjamin Warren. On The Line Connecting the Centroid of Three Points, a Fourth Point, and the Centroid of the Four Points, pp. 415-421..pdf
Volume 9 Paper 64
63. Benjamin Warren. A Perspector Involving Three Arbitrary Points on the Sides of a Triangle, pp. 413-414..pdf
Volume 9 Paper 63
62. Benjamin Warren. Semicircles Erected on the sides of a Triangle, pp. 411-412..pdf
Volume 9 Paper 62
61. Benjamin Warren. Another Perspector Regarding the Centroids of the Six Triangles Dissected by Concurrent Cevians, pp. 407-410..pdf
Volume 9 Paper 61
60. Benjamin Warren. The Midpoints of the Centroids of the Six Triangles Dissected by Concurrent Cevians are in Perspective with the Triangle, pp. 403-406..pdf
Volume 9 Paper 60
59. Benjamin Warren. Another Perspector of the Antiorthocevian Triangle, pp. 399-402..pdf
Volume 9 Paper 59
58. Benjamin Warren. A Third and Fourth Circle Passing Through the Bottema Point, pp. 396-398..pdf