@article{oai:u-ryukyu.repo.nii.ac.jp:02006501,
 author = {上坂, 章次},
 issue = {144},
 journal = {琉大農家便り},
 note = {紀要論文},
 pages = {6--7},
 title = {牛の栄養における微量元素の重要性}
}