作者单位:
Univ Nottingham, Dept Math Sci, Nottingham NG7 2RD, England
[1]
Heriot Watt Univ, Dept Math, Edinburgh EH14 4AS, Midlothian, Scotland
[2]
Univ Houston, Houston, TX 77204 USA
[3]
Rice Univ, Houston, TX 77005 USA
[4]
Univ Houston, Dept Math, Houston, TX 77204 USA
[5]
发布时间
2013-11-20