"Ostrom N. E.,Gandhi H.,Coplen T. B.,Toyoda S.,B?hlke J. K.,Brand W. A.,Casciotti K. L.,Dyckmans J.,Giesemann A.,Mohn J.,Well R.,Yu L.,Yoshida N.","Preliminary assessment of stable nitrogen and oxygen isotopic composition of USGS51 and USGS52 nitrous oxide reference gases and perspectives on calibration needs.",,"Rapid Commun. Mass Spectrom.",,"Vol. 32",,"pp. 1207-1214",2018,Aug.
"Nathaniel E. Ostrom,Hasand Gandhi,Tyler B. Coplen,Sakae Toyoda,J.K. Boehlke,Wili A. Brand,Karen L. Casciotti,Jens Dyckmans,Anette Giesemann,Joachim Mohn,Reinhard Well,Longfei Yu,Naohiro Yoshida","Preliminary assessment of stable nitrogen and oxygen isotopic composition of USGS51 and USGS52 nitrous oxide reference gases and perspectives on calibration needsJournal: Rapid Communications in Mass Spectrometry",,"Rapid Commun. Mass Spectrom.",,"Vol. 32",,"  1207-1214",2018,May