Baues, Hans-Joachim Max Planck Institute for Mathematics, Max Planck Society;
Muro, Fernando Max Planck Institute for Mathematics, Max Planck Society;
Baues, H.-J., & Muro, F. (2008). Smash products for secondary homotopy groups. Applied Categorical Structures, 16(5), 551-616. doi:10.1007/s10485-007-9071-x.