@article{CRPHYS_2020__21_2_135_0, author = {Jacques Villain}, title = {Foreword}, journal = {Comptes Rendus. Physique}, pages = {135--137}, publisher = {Acad\'emie des sciences, Paris}, volume = {21}, number = {2}, year = {2020}, doi = {10.5802/crphys.26}, language = {en}, }