EPOXIDE SPECIATION AND FUNCTIONAL GROUP DISTRIBUTION IN GRAPHENE OXIDE PAPER-LIKE MATERIALS Article Hunt A., Boyko T.D., Bazylewski P., Chang G.S., Moewes A., Dikin D.A., Kurmaev E.Z. Advanced Functional Materials. Wiley-VCH Verlag. Vol. 22. 2012. P. 3950-3957