NASA's earth science data systems standards endorsement process. - Richard E. Ullman; Yonsook Enloe (IGARSS, 2005)

The NPOESS Preparatory Project Science Data Segment: Brief Overview. - Robert J. Schweiss; Evelyn L. Ho; Richard E. Ullman; Shahin Samadi (IGARSS, 2006)

NASA's Earth Science Data Systems Standards Process experiences. - Richard E. Ullman; Yonsook Enloe (IGARSS, 2007)