1. STATE-OF-THE-ART IN THE PRIMARY ISOTOPE MEASUREMENT: WHAT IS AN “ABSOLUTE ISOTOPE AMOUNT RATIO MEASUREMENT“?. Authors: MIHAI VARLAM, STAF VALKIERS.2. A NEW EVALUATION OF THE OXYGEN CORRECTION ALGORITHM FOR CARBON AND OXYGEN ISOTOPE AMOUNT MEASUREMENTS ON CO2 GAS. Authors: MIHAI VARLAM, STAF VALKIERS.