@article{10_4153_CJM_1978_036_6,
     author = {Marcus, Marvin and Moyls, Benjamin N. and Filippenko, Ivan},
     title = {Normality and the {Higher} {Numerical} {Range}},
     journal = {Canadian journal of mathematics},
     pages = {419--430},
     year = {1978},
     volume = {30},
     number = {2},
     doi = {10.4153/CJM-1978-036-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1978-036-6/}
}