VLab: collaborative Grid services and portals to support computational material science. - Mehmet A. Nacar; Mehmet S. Aktas; Marlon E. Pierce; Zhenyu Lu; Gordon Erlebacher; Dan Kigelman; Evan F. Bollig; Cesar R. S. da Silva; Benny Sowell; David A. Yuen (Concurr. Comput. Pract. Exp., 2007)