Geodesic
$\Phi_{+}$-operators in locally convex spaces
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 23 (1968) no. 3 
Yu. N. Vladimirskii. $\Phi_{+}$-operators in locally convex spaces. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 23 (1968) no. 3. http://geodesic.mathdoc.fr/item/RM_1968_23_3_a9/
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     title = {$\Phi_{+}$-operators in locally convex spaces},
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     volume = {23},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1968_23_3_a9/}
}
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