@article{oai:repository.dl.itc.u-tokyo.ac.jp:00040217,
 author = {Ando, Naoya},
 issue = {1},
 journal = {Journal of mathematical sciences, the University of Tokyo},
 month = {},
 note = {application/pdf},
 pages = {71--87},
 title = {Umbilical Points of the Graphs of Homogeneous Polynomials of Degree 3},
 volume = {8},
 year = {2001}
}