Finding an ellipse tangent to finitely many given lines. Horwitz, Alan — 2000 Southwest Journal of Pure and Applied Mathematics [electronic only]
Illumination by Taylor polynomials. Horwitz, Alan — 2001 International Journal of Mathematics and Mathematical Sciences
Finding ellipses and hyperbolas tangent to two, three, or four given lines. Horwitz, Alan — 2002 Southwest Journal of Pure and Applied Mathematics [electronic only]
Ratio vectors of polynomial-like functions. Horwitz, Alan — 2008 JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]