Relationship on research publications and productivity-export volumes for natural rubber. - Narongrit Sombatsompop; Teerasak Markpin; Ekachai Wimolmala; Preeyanuch Ratchatahirun; N. Premkamolnetr; Boonrat Boonradsamee; Wutthisit Yochai (Scientometrics, 2009)