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Journal Article
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.
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, 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.
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, 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. 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, 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.