@article{oai:tsukuba.repo.nii.ac.jp:00015908,
 author = {H.Busemann and B.B, Phadke},
 issue = {1},
 journal = {Tsukuba Journal of Mathematics},
 month = {Jun},
 pages = {105--135},
 title = {Peakless and monotone functions on G-spaces},
 volume = {7},
 year = {1983}
}