@article{oai:minpaku.repo.nii.ac.jp:00002633,
 author = {Draper, Patricia and Howell, Nancy},
 journal = {Senri Ethnological Studies},
 month = {Dec},
 pages = {81--100},
 title = {Changes in Co-survivorship of Adult Children and Parents : Ju/’hoansi of Botswana in 1968 and 1988},
 volume = {70},
 year = {2006}
}