liblapack-doc 3.5.0-5 (s390x binary) in ubuntu xenial

 LAPACK version 3.X is a comprehensive FORTRAN library that does
 linear algebra operations including matrix inversions, least
 squared solutions to linear sets of equations, eigenvector
 analysis, singular value decomposition, etc. It is a very
 comprehensive and reputable package that has found extensive
 use in the scientific community.
 .
 This package contains the Lapack User's Guide manual in html format.
 .
 Since version 3.4.0, the HTML documentation is generated thanks to doxygen.