Geodesic
Several remarks on $n$-increasing functions in the sense of Loewner
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 1 
A. Yu. Zbarskii. Several remarks on $n$-increasing functions in the sense of Loewner. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 1. http://geodesic.mathdoc.fr/item/RM_1975_30_1_a14/
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] K. Löwner, “Über monotone Matrixfunktionen”, Math. Z., 38:2 (1934), 177–216 | DOI | MR

[2] E. Heinz, “Beitrage zur störungen Theorie der Spektralzerlegung”, Math. Ann., 123 (1951) | DOI | MR | Zbl