@article{oai:tsukuba.repo.nii.ac.jp:00016013,
 author = {Oka, Shinpei},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {173--194},
 title = {A generalization of free L-spaces},
 volume = {5},
 year = {1981}
}