MacIntosh, Scott, Tolboll, Rasmus, Birken, Ralf, and Zhu, Qifu, 2006, Large-scale mapping of complex utility lines with a broadband electromagnetic induction array: Proceedings of SAGEEP 2006, Seattle, Washington, CD-ROM.

MacIntosh, Scott, Birken, Ralf, and Zhu, Qifu, 2006, Correcting 3D position measurement for geophysical surveys using a tilt sensor system: Proceedings of SAGEEP 2006, Seattle, Washington, CD-ROM.

Birken, Ralf, Deming, Ross, Hansen, Thorkild, MacIntosh, Scott, Oristaglio, Michael and Zhu, Qifu, 2006, Utility mapping in urban areas with dual radar and induction arrays: Proceedings of SAGEEP 2006, Seattle, Washington, CD-ROM.

Green, Robert, Lund, Andrew, and Birken, Ralf, 2006, Generation of utility mapping data via processing of multi-channel signals collected by arrays of GPR and EM antennae: Proceedings of TRB 85th Annual Meeting, Washington, DC, CD-ROM.

Birken, Ralf, Deming, Ross, Oristaglio, Michael, and Hansen, Thorkild, 2005, Infrastructure mapping in urban areas with dual radar and induction arrays: Proceedings of SEG 2005, Houston, Texas, CD-ROM.

Oristaglio, Michael, Birken, Ralf, Hansen, Thorkild, Deming, Ross, MacIntosh, Scott and Zhu, Qifu, 2005, Efficient large-scale utility mapping with radar and induction arrays: Proceedings of SAGEEP 2005, Atlanta, Georgia, CD-ROM.

Birken, Ralf, Hansen, Thorkild, Deming, Ross, and Oristaglio, Michael, 2004, Locating pipelines with a broadband electromagnetic induction array system: Proceedings of SAGEEP 2004, Colorado Springs, Colorado, CD-ROM.

Thorkild Hansen, Michael Oristaglio, Douglas Miller, Maclyn Burns, Anthony Derubeis, Paul Albats, Robert Casadonte, Ross Deming, Ralf Birken, Jakob Haldorsen, 2002, Efficient large-scale underground utility mapping with a multi-channel ground-penetrating imaging radar system: URSI General Assembly, Maastricht, Holland, 4 pp.(invited paper).

Birken, Ralf, Miller, Douglas, Burns, Maclyn, Albats, Paul, Casadonte, Robert, Deming, Ross, Derubeis, Tony, Hansen, Thorkild and Oristaglio, Michael, 2002, Efficient large-scale underground utility mapping in new york city using a multi-channel ground-penetrating imaging radar system: in 9th international conference on ground penetrating radar (GPR 2002), Steven Koppenjan, Hua Lee (editors), Proceedings of the SPIE Vol. 4758, 186-191.

Birken, Ralf, Miller, Douglas, Burns, Maclyn, Albats, Paul, Casadonte, Robert, Deming, Ross, Derubeis, Tony, Hansen, Thorkild and Oristaglio, Michael, 2002, Efficient large-scale underground utility mapping using a new multi-channel ground-penetrating imaging radar system: Proceedings of GEOPHYSICS 2002, Los Angeles, CA, April 15-19, CD-ROM.

Birken, Ralf, Miller, Douglas, Burns, Maclyn, Albats, Paul, Casadonte, Robert, Deming, Ross, Derubeis, Tony, Hansen, Thorkild and Oristaglio, Michael, 2002, Efficient large-scale subsurface underground utility mapping with a multi-channel ground-penetrating imaging radar system: Proceedings of the Symposium on the application of geophysics to engineering and environmental problems (SAGEEP 2002), February 10-13, 2002, Las Vegas, Nevada, Environmental and Engineering Geophysical Society, CD-ROM.