SIMBAD references

Radio observations of gravitational lenses are an important case in which the data reduction and scientific analysis should and need not be separated. We present results of LensClean applied to a lensed BL Lac object B0218+357 showing the power of combining the two tasks. LensClean produces improved maps and constrains the lens model by minimizing the residuals between the best lensed source emission model and the observed data. One important result is an estimate of the Hubble constant from the time-delay in the lens B0218+357.