NEC-LIST: how can a skewed dipole above a lossy groundcan be modeled by nec?

These days, i am thinking about the modeling of skewed wires above a lossy ground.
NEC can deal well with it by several ways. I want to acquire some basic knowledge
of the Sommerfeld Integral and have found the derivation of it in the cases of the
horizontal and vertical dipoles. However, i did not find the sommerfeld integral for skewed
  ones. i am so grateful to ones who can give me the form of the sommerfeld intergral of
 skewed dipoles or who can give me a list of references.

another question:
 how does the nec deal with the lossy ground? does it integrate the Sommerfeld Integral directly?

Sorry for my poor english, thank you all
                                            08/07/16

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