TY - JOUR AU - Braides, Andrea AU - Vallocchia, Valerio ED - Buttazzo, G. ED - Casas, E. ED - de Teresa, L. ED - Glowinski, R. ED - Leugering, G. ED - Trélat, E. ED - Zhang, X. TI - Two geometric lemmas for $S^{N - 1}$-valued maps and an application to the homogenization of spin systems JO - ESAIM: Control, Optimisation and Calculus of Variations PY - 2021 VL - 27 PB - EDP-Sciences UR - https://www.numdam.org/articles/10.1051/cocv/2021007/ DO - 10.1051/cocv/2021007 LA - en ID - COCV_2021__27_1_A13_0 ER -