TY - CONF AU - Clifton, C AU - Mikaia, Anzor AU - Stein, Stephen C2 - 42nd ASMS conference on mass spectrometry and allied topics, Chicago, IL, US DA - 1994-05-29 00:05:00 LA - en PB - 42nd ASMS conference on mass spectrometry and allied topics, Chicago, IL, US PY - 1994 TI - Problems and progress in the measurement of reference mass spectra ER -