Takamatsu, K., Kozaki, Y., Muarakami, K., Bannaka, K., Mitsunari, K. and Nakata, Y. (2018) “NEW ANALYSIS OF VISUALIZATION IN EDUINFORMATICS USING A NETWORK WITH PARAMETRIC AND NONPARAMETRIC CORRELATION COEFFICIENTS WITH THRESHOLD”, PEOPLE: International Journal of Social Sciences, 4(1), pp. 619–630. doi: 10.20319/pijss.2018.41.619630.