Journal article published in 2002 by Martin J. Bly, Alan J. Chipperfield, David L. Giaretta, Vito G. Graffagnino, Brian K. McIlwrath, Roy T. Platon, Patrick T. Wallace, Alasdair Allan, David S. Berry, Clive Davenhall, Peter W. Draper , Norman Gray, Tim Jenness, Mark B. Taylor