By Riordan, Michael, Schramm, David N., Hawking, Stephen
By Schramm, Professor Gunter, Warford, Professor Jeremy
By Clancy, Marilyn D., Clancy, Schramm, Ron
By Lederman, Leon M., Schramm, David N.
By Mourlevat, Jean-Claude, Schramm, Phil, Bell, Anthea