Problem 10810. - Juan-Bosco Romero Márquez (Am. Math. Mon., 2000)

A Cute Characterization of Acute Triangles: 10713. - Juan-Bosco Romero Márquez; Heinz-Jürgen Seiffert (Am. Math. Mon., 2000)

A Parallelogram Inscribed in a Quadrilateral: 10810. - Juan-Bosco Romero Márquez; Mohammed Ali Salem (Am. Math. Mon., 2001)

Problem 11105. - Juan-Bosco Romero Márquez; Rick Luttmann; Miguel de Guzman; G. Donald Chakerian (Am. Math. Mon., 2004)

Gamma Function Bounds: 11016. - Juan-Bosco Romero Márquez; Martin E. Muldoon (Am. Math. Mon., 2005)

Cevians and Centroids: 11105. - Juan-Bosco Romero Márquez; Rick Luttmann; Miguel de Guzman; G. Donald Chakerian; Li Zhou 001 (Am. Math. Mon., 2006)