@article{10_4153_CJM_1970_113_8,
     author = {Stampfli, J. G.},
     title = {A {Spectral} {Theory} for {Duality} {Systems} of {Operators} on a {Banach} {Space}},
     journal = {Canadian journal of mathematics},
     pages = {994--996},
     year = {1970},
     volume = {22},
     number = {5},
     doi = {10.4153/CJM-1970-113-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1970-113-8/}
}