THERMAL PERFORMANCE OF ROOFTOP GREENERY SYSTEM AT THE TROPICAL CLIMATE OF MALAYSIA A case study of a 10 storied building R.C.C flat rooftop at UTM, Johor Bahru, Malaysia - Rashid, Rumana; Phd. in architecture (Candidate), Department of Architecture, Faculty of Built Environment Universiti Teknologi Malaysia (UTM) (Institute of Research and Community Outreach - Petra Christian University, 2011)