Yasuhiro Yamamoto Kumiyo Nakakoji Yoshiyuki Nishinaka Mitsuhiro Asada Ryouichi Matsuda What is the space for?: the role of space in authoring hypertext representations. 117-125 2005 conf/ht/2005 Hypertext http://doi.acm.org/10.1145/1083356.1083378 db/conf/ht/ht2005.html#YamamotoNNAM05