@article{oai:repository.dl.itc.u-tokyo.ac.jp:00040110,
 author = {Nagase, Teruo    Shima  Akiko},
 issue = {1},
 journal = {Journal of mathematical sciences, the University of Tokyo},
 month = {Mar},
 note = {application/pdf},
 pages = {69--97},
 title = {Properties of minimal charts and their applications I},
 volume = {14},
 year = {2007}
}