@article{oai:yamagata.repo.nii.ac.jp:00000647,
 author = {Sato,  Kunio},
 issue = {1},
 journal = {山形大学紀要.工学},
 month = {Jan},
 note = {論文(Article), Abstract　We give a unified proof of the global approximation theorem in the critical case α = 2, which have been treated individually by several authors. Our proof applies to all exponential-type operators with φ(x) of degree not exceeding 2.},
 pages = {75--77},
 title = {Critical Case in the Global Approximation Theorem},
 volume = {18},
 year = {1984}
}