Martin, J. H., Knauer, G. A., and Gordon, R. M., 1983. Silver distributions and fluxes in north-east Pacific waters. Nature 305: 306-309. 

Flegal, A. R., Sanudo-Wilhelmy, and Scelfo, G. M., 1995. Silver in the eastern Atlantic Ocean. Mar. Chem. 49: 315-320.