Ma L., Castro M.C, Hall C.M, Walter L.M.  2005.  Cross-formational flow and salinity sources inferred from a combined study of helium concentrations, isotopic ratios, and major elements in the Marshall aquifer, southern Michigan. Geochemistry Geophysics Geosystems. 6(10)

Hall C.M, Castro M.C, Lohmann K.C, Ma L..  2005.  Long term calibration of the Noble gas temperature system in a shallow unconfined Pleistocene aquifer. Eos Trans. AGU Fall Meeting Supplement. 86(52)

Hall C.M, Castro M.C, Lohmann K.C, Ma L..  2005.  Noble gases and stable isotopes in a shallow aquifer in southern Michigan: Implications for noble gas paleotemperature reconstructions for cool climates. Geophysical Research Letters. 32(18):1-4.

Ma L., Castro M.C, Hall C.M, Walter L.M.  2005.  Unusually high helium fluxes in the shallow Marshall aquifer in southern Michigan: implications for cross-formational flow and salinity sources. Eos Trans. AGU Fall Meeting Supplement. 86(52)

Ma L., Castro M.C, Hall C.M.  2004.  A late Pleistocene-Holocene noble gas paleotemperature record in southern Michigan. Geophysical Research Letters. 31(23):1-24.