TY - RPRT TI - Microwave spectroscopy of labile molecules : I. transition types, frequencies, and intensities AU - Kurland, R J AU - Mann, D E PY - 1956 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS report ; 4649 DO - 10.6028/NBS.RPT.4649 ER -