Geodesic
Representability of de Branges Matrices as Blaschke--Potapov Products and Completeness of Some Families of Functions
Matematičeskie zametki, Tome 73 (2003) no. 6, pp. 841-847

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Criteria for the representability of meromorphic second-order matrix functions $J$-expanding in the upper half-plane (de Branges matrices) as left, right, and two-sided Blaschke–Potapov products are stated. Results on the spectral structure of operators whose characteristic matrix functions are de Branges matrices are obtained. 
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     author = {G. M. Gubreev and A. A. Tarasenko},
     title = {Representability of de {Branges} {Matrices} as {Blaschke--Potapov} {Products} and {Completeness} of {Some} {Families} of {Functions}},
     journal = {Matemati\v{c}eskie zametki},
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     number = {6},
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G. M. Gubreev; A. A. Tarasenko. Representability of de Branges Matrices as Blaschke--Potapov Products and Completeness of Some Families of Functions. Matematičeskie zametki, Tome 73 (2003) no. 6, pp. 841-847. http://geodesic.mathdoc.fr/item/MZM_2003_73_6_a4/