C. David Muller, Aurelle Falcou, Nina Reckefuss, Markus rojahn, Valerle Wiederhirn, Paula rudati, Holger Frohne, Oskar Nuyken, Heinrich Becker & Klaus Meerholz
Nature 2003, 421, 829
and the patent for making indenofluorenes:
Aryl-substituted polyindenofluorenes for use in organic electroluminiscent devices
Assignee: Covion Organic Semiconductors GmbH
wo_04041901_a1
and a review mentioning the above:
Patterning surfaces with functional polymers
Zhihong Nie and Eugenia Kumacheva
Nature Materials 2008, 7, 277