Steinmetz, Gustavo, Luís Guilherme Eich, Gustavo Lazarotto Schroeder, Rosemary Francisco, and Jorge Luis Victória Barbosa.
" XPCodeHub: A gamified system model for learning programming through knowledge trails." <em>Proceedings of the 33rd Brazilian Symposium on Computers in Education,
Manaus, 2022</em>. SBC, 2022,  
pp.1367-1378.