103 citations · 129 across the 29 of their papers we have counts for
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math.FA2013
Products of generalized Nevanlinna functions with symmetric rational functions
S. Hassi, H. L. Wietsma
New classes of generalized Nevanlinna functions, which under multiplication with an arbitrary fixed symmetric rational function remain generalized Nevanlinna functions, are introdu…
math.FA2013
Q-functions and boundary triplets of nonnegative operators
Yury Arlinskii, Seppo Hassi
Operator-valued -functions for special pairs of nonnegative selfadjoint extensions of nonnegative not necessarily densely defined operators are defined and their analytical prop…