Zigah P.K, Minor E.C, Werne J.P, S. McCallister L.  2012.  An isotopic (Delta C-14, delta C-13, and delta N-15) investigation of the composition of particulate organic matter and zooplankton food sources in Lake Superior and across a size-gradient of aquatic systems. BIOGEOSCIENCES. 9:3663-3678.

Zigah PK, Minor EC, Werne JP, S. McCallister L.  2011.  Radiocarbon and stable carbon isotopic insights into provenance and cycling of carbon in Lake Superior. LIMNOLOGY AND OCEANOGRAPHY. 56:867-886.