Your search returned the following 3 documents:

3. Determining human immunodeficiency virus coreceptor use in a clinical setting: Degree of correlation between two phenotypic assays and a bioinformatic model
   Katharina Skrabal, Andrew J. Low, Winnie Dong, Tobias Sing, Peter K. Cheung, Fabrizio Mammano, and P. Richard Harrigan
   Journal of Clinical Microbiology 45 (2): 279-284, 2007
   
   
2. Predicting HIV coreceptor usage on the basis of genetic and clinical covariates
   Tobias Sing, Andrew J. Low, Niko Beerenwinkel, Oliver Sander, Peter K. Cheung, Francisco S. Domingues, Joachim Büch, Martin Däumer, Rolf Kaiser, Thomas Lengauer, and P. Richard Harrigan
   Antiviral Therapy 12 (7): 1097-1106, 2007
   
1. Structural Descriptors of gp120 V3 Loop for the Prediction of HIV-1 Coreceptor Usage
   Oliver Sander, Tobias Sing, Ingolf Sommer, Andrew J. Low, Peter K. Cheung, P. Richard Harrigan, Thomas Lengauer, and Francisco S. Domingues
   PLoS Computational Biology 3 (3): 555-564, 2007
   [PDF: Download: Sander.pdf]