Geodesic
A remark to the definition of Nevanlinna matrices
Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 3 (1996) no. 3, pp. 412-422 Cet article a éte moissonné depuis la source Math-Net.Ru

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We prove that the unimodular entire matrix-function $$\left(\begin{array}{cc}A(z)&B(z)\\C(z)&D(z)\end{array}\right)$$ with real entries is a Nevanlinna matrix provided that the three quotients $B/A$, $A/C$, and $D/C$ have positive imaginary part in the upper half-plane. 
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     author = {Mikhail Sodin},
     title = {A remark to the definition of {Nevanlinna} matrices},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {412--422},
     year = {1996},
     volume = {3},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JMAG_1996_3_3_a12/}
}
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Mikhail Sodin. A remark to the definition of Nevanlinna matrices. Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 3 (1996) no. 3, pp. 412-422. http://geodesic.mathdoc.fr/item/JMAG_1996_3_3_a12/