@article{oai:tsukuba.repo.nii.ac.jp:00020549,
 author = {Sakamoto, Reiko},
 issue = {1},
 journal = {Tsukuba Journal of Mathematics},
 month = {Jun},
 pages = {111--145},
 title = {Energy method for numerical analysis},
 volume = {29},
 year = {2005}
}