Fractional high-harmonic combs by attosecond-precision split-spectrum pulse controlPhilipp Raith, Christian Ott, Christopher P. Anderson, Andreas Kaldun, Kristina Meyer, Martin Laux, Yizhu Zhang and Thomas PfeiferEPJ Web of Conferences, 41 (2013) 01007DOI: https://doi.org/10.1051/epjconf/20134101007