@article{oai:u-ryukyu.repo.nii.ac.jp:02005351,
 author = {Nishishiraho, Toshihiko and 西白保, 敏彦},
 journal = {Ryukyu mathematical journal},
 month = {Feb},
 note = {The convergence on approximation processes of quasi-positive linear operators is discussed. The results are then applied to obtain several Korovkin test systems., 紀要論文},
 pages = {65--79},
 title = {Approximation processes of quasi-positive linear operators},
 volume = {5},
 year = {1993}
}