Imaging the midcontinent rift beneath Lake Superior using large aperture seismic data - Trehu, Anne; Morel-a-l’Huissier, Patrick; Meyer, R.; Hajnal, Z.; Karl, J.; Mereu, R.F.; Sexton, John; Shay, J.; Chan, W.; Epili, D.; Jefferson, T.; Shih, X.; et al. (Geophysical Research Letters, 1991)