Informal interactions and their implications for online courses. - Juan Contreras-Castillo; Jesús Favela; Carmen Pérez-Fragoso; Eduardo Santamaría-del-Ángel (Comput. Educ., 2004)

Assessing the use of instant messaging in online learning environments. - Juan Contreras-Castillo; Carmen Pérez-Fragoso; Jesús Favela (Interact. Learn. Environ., 2006)