P. K.  Zigah, Minor, E. C., Abdulla, H. A. N., Werne, J. P., and Hatcher, P. G., ?An investigation of size-fractionated organic matter from Lake Superior and a tributary stream using radiocarbon, stable isotopes and NMR?, Geochimica et Cosmochimica Acta, vol. 127, pp. 264-284, 2014.

P. K.  Zigah, Minor, E. C., Abdulla, H. A. N., Werne, J. P., and Hatcher, P. G., ?An investigation of size-fractionated organic matter from Lake Superior and a tributary stream using radiocarbon, stable isotopes and NMR?, Geochimica et Cosmochimica Acta, vol. 127, pp. 264 - 284, 2014.