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      <subfield code="a">García Planas, María Isabel</subfield>
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      <subfield code="a">Tarragona, Sonia</subfield>
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      <subfield code="a">Small perturbations of simple eigenvalues&#xd;
with a change of parameters is a problem of general&#xd;
interest in applied mathematics. The aim of this work is&#xd;
to study the behavior of a simple eigenvalue of singular&#xd;
linear system family&#xd;
E(p)x'_ = A(p)x + B(p)u;&#xd;
y = C(p)x&#xd;
 smoothly dependent on real parameters p = (p1,..., pn).</subfield>
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      <subfield code="a">Linear systems</subfield>
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systems output-observability.</subfield>
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