A UREA EXTRACTIVE CRYSTALLIZATION PROCESS FOR MANUFACTURING LOW FREEZING POINT PETROLEUM PRODUCTS AND n-PARAFFINS
LI SHU-XUN, Hu YING-JON, XuE CHENG, LIAU WEI-REN, CHENG PEI-CHANG (Research Institute of Petroleum Science, Ministry of Petroleum Industry)
CIESC Journal . 1958, (2): 89 -94 .