Pavel Kurasov, Igor Lelyavin, Serguei Naboko. On the
essential spectrum of a class
of singular matrix differential operators. II \\
Weyl's limit circles for Hain-Lüst operator whenever
quasiregularity conditions are not satisfied.
Publication date: March 20, 2006. Keywords: Hain-Lüst operator, singularity spectrum.
