Publications from the Instituut-Lorentz in the year 1939

   * Belinfante FJ
           Undor calculus and charge-conjugation
           PHYSICA 6: 849 (1939)

   * Belinfante FJ
           The undor equation of the meson field
           PHYSICA 6: 870 (1939)

   * Opechowski W, de Vries DA
           Isotope shift in the boron spectrum
           PHYSICA 6: 93 (1939)

   * Becquerel J, Opechowski W
           Pouvoir rotatoire paramagnetique et aimantation du 
           fluosilicate de nickel hexahydrate, dans la direction 
           de l'axe optique - Le champ cristallin
           PHYSICA 6: 1039 (1939)