@article{oai:tsukuba.repo.nii.ac.jp:00016010,
 author = {Tanaka, Hidenori},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {565--587},
 title = {Covering properties in countable products},
 volume = {17},
 year = {1993}
}