http://books.google.com/books?id=zKfamMJHvuYC&pg=PA11&lpg=PA11&dq=A+Quadrature+Rule+for+the+Finite+Hilbert+Transform+Via+Midpoint+Type+Inequalitites&source=bl&ots=mVn3afXyGB&sig=uWTe4pbX2qEVviiKuUQiJgRLrfM&hl=en&ei=NxVNS5_bNYnwsQOCmcWKAQ&sa=X&oi=book_resu