eJournalPlus: development of a collaborative learning system for constructive and critical reading skills. - Toshio Mochizuki; Hiroki Oura; Tomomi Sato; Toshihisa Nishimori; Mio Tsubakimoto; Jun Nakahara; Yuhei Yamauchi; Johansson Kjell Henrik; Kenichiro Matsumoto; Shinichi Watanabe; Takashi Miyatani (CSCL (2), 2009)