Roberto Verdone ... [et al.]. Robert Gordon ... [et al.] Robert C. Reardon ... [et al.]. Robert Deng ...[et al.] Robert Kegan ... [et al. Robert C. Carson ... [et al.]. Robert Jurmain ... [et al.]. Robert D. Cook ... [et al.]. Robert Heinich ... [et al.]. Robert J. Moore ... [et al.]