Finite unification: theory and predictions. Heinemeyer, Sven, Mondragón, Myriam, Zoupanos, George (2010) SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
Free field construction of D-branes in rational models of CFT and Gepner models. Parkhomenko, Sergei E. (2008) SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]