@article{oai:niigata-u.repo.nii.ac.jp:00002020,
 author = {Motoki, Tatsuya},
 issue = {3},
 journal = {Journal of Computer and System Sciences, Journal of Computer and System Sciences},
 month = {Dec},
 note = {We apply a result/concept on star height to two problems in the theory of control structures. First, we generalize Kosaraju’s systems RE_n of control structures and show, by using Cohen’s result on star height, that the generalized systems constitute a path-wise hierarchy with respect to their expressive powers. Second, by using a concept on star height, we sharpen Peterson et al.'s result that RE_∞ is path-wisely complete.},
 pages = {312--329},
 title = {An Application of Cohen's Result on Star Height to the Theory of Control Structures},
 volume = {29},
 year = {1984}
}