... H.Buhmann, W.Joss, K.von Klitzing, I.V.Kukushkin, G.Martinez, A.S.Plaut, K.Ploog, V.B.Timofeev. Novel magneto-optical behavior in the Wigner-solid regime." ... Comment on "'Magneto-optical evidence for fractional quantum Hall states down to filling factor 1/9" (and reply). ... I.V.Kukushkin, V.I.Fal'ko, K. von Klitzing, K.Ploog, D.Heitmann. ... I.V.Kukushkin, K.von Klitzing, K.Eberl "Spin polarization of two-dimensional electrons in different fractional states and around filling factor 1." ...