Increasing the lateral resolution of scanning microscopes by a factor of two using 2-Image microscopyNicolas Sandeau, Laure Wawrezinieck, Patrick Ferrand, Hugues Giovannini and Hervé RigneaultJ. Eur. Opt. Soc.-Rapid Publ., 4 (2009) 09040DOI: https://doi.org/10.2971/jeos.2009.09040