Manuel Ojeda-Hernández Francisco Pérez-Gámez Domingo López-Rodríguez Nicolás Madrid Ángel Mora 0001 Minimal Generators from Positive and Negative Attributes: Analysing the Knowledge Space of a Mathematics Course. 58 2022 15 Int. J. Comput. Intell. Syst. 1 https://doi.org/10.1007/s44196-022-00123-3 db/journals/ijcisys/ijcisys15.html#Ojeda-Hernandez22