Forming Groups for Collaborative Learning of Introductory Computer Programming Based on Students' Programming Skills and Learning Styles. - Juan Manuel Adán Coello; Carlos Miguel Tobar; Eustáquio São José de Faria; Wiris Serafim de Menezes; Ricardo Luís de Freitas (Int. J. Inf. Commun. Technol. Educ., 2011)