SpringerLink (Online service) - Fay, Richard R. - Hawkins, Anthony D. - Mann, David A. - Bartol, Soraya. - Carlson, Thomas J. - Coombs, Sheryl. - Ellison, William T. - Gentry, Roger L. - Halvorsen, Michele B. - Løkkeborg, Svein. - Rogers, Peter H. - Southall, Brandon L. - Zeddies, David G. - Tavolga, William N.