[edited by] Monica Florin-Christensen. edited by P. Thoft-Christensen. edited by Carl R. Christiansen. edited by Monica M. Gardner. [edited by] Bryan Christiansen. edited by Agnete Munch-Petersen. edited by John Bu'Lock and Bjorn Kristiansen. edited by Monica Lee. edited by Niels Bjorn-Andersen. edited by Sven Erik Jorgensen.