VALLEJO, E. A.(2014). What are we talking about?. En Mathematics Lessons Learned from Across the World PK-8. (pp. 27 - 31). National Council of Teachers of Mathematics.
MALASPINA, U. V. y VALLEJO, E. A.(2014). PROBLEM POSING IN PRESERVICE PRIMARY SCHOOL TEACHERS¿ TRAINING. En 38th Conference of the International Group for the Psychology of Mathematics Education and the 36th Conference of the North American Chapter of the PME. (pp. 159 - 159). VANCOUVER. PME. Recuperado de: http://www.pme38.com/
MALASPINA, U. V. y VALLEJO, E. A.(2014). Creación de Problemas en la Docencia e Investigación. En Reflexiones y Propuestas en Educación Matemática. (pp. 7 - 54). LIMA. Editorial Moshera SRL.
VALLEJO, E. A. y ORDOÑEZ, C. C.(2014). 3rd graders construction of division and divisibility knowledge only depending on a key notion. En Conference of the International Group for the Psychology of Mathematics Education and the 36th Conference of the North American Chapter of the Psychology of Mathematics Education. (pp. 400 - 400). VANCOUVER: PME. Recuperado de: http://www.pmena.org/proceedings/PMENA%2036%20PME%2038%202014%20Proceedings%20Vol%206.pdf
VALLEJO, E. A. y MALASPINA, U. V.(2012). A LOOK AT THE JUSTIFICATIONS IN THE BASIC EDUCATION IN PERU: THE NATIONAL CURRICULUM DESIGN AND SOME TEXTS USED IN THE 1ST GRADE OF SECONDARY LEVEL. En En 12th International Congress on Mathematical Education(ICME-12). (pp. 7502 - 7502). SEÚL. ICMI. Recuperado de: http://icme12.org/data/ICME12_Proceedings_20120712.zip
