Páez, C. et al. 2019. Exam problems and solutions XXIX Costa Rican Mathematics Olympiad: Problemas de exámenes y soluciones XXIX Olimpiada Costarricense de Matemáticas. Mathematics, Education and Internet Journal. 19, 2 (Apr. 2019). DOI:https://doi.org/10.18845/rdmei.v19i2.4233.