GLIMS: Progress in mapping the world's glaciers. - Bruce H. Raup; Siri Jodha S. Khalsa; Richard Armstrong; Christopher Helm; Mark B. Dyurgerov (IGARSS, 2007)

Remote sensing and GIS technology in the Global Land Ice Measurements from Space (GLIMS) Project. - Bruce H. Raup; Andreas Kääb; Jeffrey S. Kargel; Michael P. Bishop; Gordon Hamilton; Ella Lee; Frank Paul; Frank Rau; Deborah Soltesz; Siri Jodha Singh Khalsa; Matthew Beedle; Christopher Helm (Comput. Geosci., 2007)

Representing scientific data sets in KML: Methods and challenges. - Lisa M. Ballagh; Bruce H. Raup; Ruth E. Duerr; Siri Jodha S. Khalsa; Christopher Helm; Doug Fowler; Amruta Gupte (Comput. Geosci., 2011)

Demand dynamics across secondary German Book markets: an information aggregation and synthetization approach. - Christopher Helm; Tim A. Herberger; Marcel Tyrell (Inf. Syst. E Bus. Manag., 2021)