Physics Physique Natuurkunde 20 33.00 physics: general 8 Zeitschrift 4 E ́tude et enseignement 3 Pe ́riodiques 3 Study and teaching 3 Chemistry, Physical and theoretical 2 Chimie physique et the ́orique 2 Condensed matter 2 Data processing 2 Fysische chemie 2 Histoire 2 History 2 Informatique 2 Mathematical physics 2 Matie`re condense ́e 2 Philosophie 2 Philosophy 2 Physik 2 Physique mathe ́matique 2 Toepassingen 2 Vakdidactiek 2 33.04 teaching, profession and organizations of physics 1 33.18 classical optics 1 33.30 atomic and molecular physics: general 1 33.38 modern optics 1 35.10 physical chemistry: general 1 Astrophysics 1