Some of the source files are not written by the author of this package. This is a complete list of these files:

dqelg.f     j4save.f    xermax.f     dqagp.f
dqk15i.f    lsame.f     xermsg.f     xerdmp.f
dqk21.f      xerprn.f    dqpsrt.f    xerhlt.f
xersve.f     fdump.f     xgetf.f     dgeco.f      
xgetua.f     dgedi.f     xgetun.f    dgefa.f      
dqagie.f     xerclr.f    dqagi.f     initds.f    
xercnt.f     dqagpe.f             

These files are from the library SLATEC Common Mathematical Library (Some are originally from LINPACK or QUADPACK). You can find the complete libraries at www.netlib.org.
