Muth, C.; P.S. Lee; J. C. Shiue, W. Allan Webb (27 December 2004). “Advanced Technology Microwave Sounder on NPOESS and NPP”. Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings. 2004 IEEE International4: 2454–2458. doi:10.1109/IGARSS.2004.1369789.