@article{oai:tsukuba.repo.nii.ac.jp:00015713,
 author = {K.R., Unni and C.Puttamadaiah},
 issue = {1},
 journal = {Tsukuba Journal of Mathematics},
 month = {Jun},
 pages = {111--116},
 title = {On joint numerical ranges and joint normaloids in a C*-algebra},
 volume = {10},
 year = {1986}
}