@article{JRC14898, address = {}, year = {1997}, author = {Aregbe Y and Valkiers S and Mayer K and De Bievre P and Wessel R and Alink A}, abstract = {Abstract not available }, title = {Measuring Amount Ratios of Gas Isotopes by Two Primary Methods of Measurement.}, type = {}, url = {}, volume = {35}, number = {}, journal = {Metrologia}, pages = {7-16}, issn = {}, publisher = {}, doi = {} }