@article{oai:nagasaki-u.repo.nii.ac.jp:00012014,
 author = {Fukaura, Atsuyuki},
 issue = {3},
 journal = {經營と經濟, Journal of Business and Economics},
 month = {Dec},
 note = {経営と経済, 70(3), pp.81-90; 1990},
 pages = {81--90},
 title = {On the Effort Function},
 volume = {70},
 year = {1990}
}