Paces, James B.; Miller, James D. (1993). "Precise U-Pb ages of Duluth Complex and related mafic intrusions, northeastern Minnesota: Geochronological insights to physical, petrogenetic, paleomagnetic, and tectonomagmatic processes associated with the 1.1 Ga Midcontinent Rift System". Journal of Geophysical Research: Solid Earth. 98 (B8): 13997–14013. Bibcode:1993JGR....9813997P. doi:10.1029/93JB01159. ISSN0148-0227.
Paces, James B.; Miller, James D. (1993). "Precise U-Pb ages of Duluth Complex and related mafic intrusions, northeastern Minnesota: Geochronological insights to physical, petrogenetic, paleomagnetic, and tectonomagmatic processes associated with the 1.1 Ga Midcontinent Rift System". Journal of Geophysical Research: Solid Earth. 98 (B8): 13997–14013. Bibcode:1993JGR....9813997P. doi:10.1029/93JB01159. ISSN0148-0227.
Paces, James B.; Miller, James D. (1993). "Precise U-Pb ages of Duluth Complex and related mafic intrusions, northeastern Minnesota: Geochronological insights to physical, petrogenetic, paleomagnetic, and tectonomagmatic processes associated with the 1.1 Ga Midcontinent Rift System". Journal of Geophysical Research: Solid Earth. 98 (B8): 13997–14013. Bibcode:1993JGR....9813997P. doi:10.1029/93JB01159. ISSN0148-0227.