TY -的盟Kalikakis Dimitrios e . PY - 2002 DA - 1900/01/01 TI -在非正规的鞍表面的曲率双曲和球面立体SP - 382157六世- 7 AB - SN - 1085 - 3375 UR - https://doi.org/10.1155/S1085337502000799 - 10.1155 / S1085337502000799 JF -抽象和应用分析PB - Hindawi出版公司KW - ER