Chi, N. K., Tâm, N. M. and Phượng, Đặng N. (2012) “STUDY METHOD ON TIME AND MOTION OF SOLID WASTE COLLECTION AND TRANSPORTATION CASE STUDY IN 6 SITES OF HANOI”, Vietnam Journal of Science and Technology. Hanoi, VN, 48(2). doi: 10.15625/0866-708X/48/2/1129.