@inproceedings{weko_118982_1, author = "奥田,浩", title = "有向境界曲線列を持つ曲面の平均法線ベクトルの求め方", booktitle = "全国大会講演論文集", year = "1990", volume = "第40回", number = "システム", pages = "1518--1519", month = "mar" }