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Journal Article
B.N Murdin, C Langerak, M. Helm, P. Kruck, W. Heiss, V. Rosskopf, G. Strasser, E. Gornik, M. Dur, S.M Goodnick et al.Time resolved studies of intersubband relaxation in GaAs/AlGaAs quantum wells below the optical phonon energy using a free electron laser, Superlattices and Microstructures 119 (1996) 17-24.
T. Grange, E.A. Zibik, R. Ferreira, G. Bastard, B.A Carpenter, P.J Phillips, D. Stehr, S. Winnerl, M. Helm, M.J Steer et al.Singlet and triplet polaron relaxation in doubly charged self-assembled quantum dots, New Journal of Physics 9 (2007) 
B.N Murdin, N. Nasser, C Langerak, W. Heiss, M. Helm, G. Strasser, E. Gornik, S.C Lee, I. Galbraith, C.R PidgeonIntersubband dynamics below the optical phonon energy for single and coupled quantum well systems, Physica Status Solidi B-Basic Research 1204 (1997) 208-211.
T. Dekorsy, V.A Yakovlev, W. Seidel, M. Helm, F. KeilmannInfrared-phonon-polariton resonance of the nonlinear susceptibility in GaAs, Physical Review Letters 590 (2003) 
B.N Murdin, M. Helm, C.R Pidgeon, K.K Geerinck, N. Hovenyer, W.T Wenckebach, A.FG van der Meer, P.W van AmersfoortFree-Electron Laser-Induced Bleaching of the Intersubband Absorption in Semiconductor Quantum-Wells, Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment 1-3341 (1994) 178-180.
B.N Murdin, G.M.H. Knippels, A.FG van der Meer, C.R Pidgeon, C Langerak, M. Helm, W. Heiss, K. Unterrainer, E. Gornik, K.K Geerinck et al.Excite-Probe Determination of the Intersubband Lifetime in Wide Gaas/Algaas Quantum-Wells Using a Far-Infrared Free-Electron Laser, Semiconductor Science and Technology 89 (1994) 1554-1557.
B.N Murdin, W. Heiss, C Langerak, S.C Lee, I. Galbraith, G. Strasser, E. Gornik, M. Helm, C.R PidgeonDirect observation of the LO phonon bottleneck in wide GaAs/AlxGa1-xAs quantum wells, Physical Review B 855 (1997) 5171-5176.