Moonen et al., (1992), J.Magn. Reson. 97, 419-425 (GEXSY)
Stonehouse et al., (1994) JACS, 116, 6037-6038 (GOESY)
Stott et.al., (1995) JACS, 117, 4199-4200 (GOESY)
Hope that helps. Chris