7Yoon B, Lee S, Lee G. Development and application of a keyword - based knowledge map for effective R&D planning [ J ]. Seientometrics, 2010, 85 ( 3 ) : 803 - 820.
8Lee B, Jeong Y I. Mapping Korea' s national R&D do- main of robot technology by using the co - word analysis [J]. Seientometries, 2008, 77(1): 3-19.
