@article {8638,
	title = {Observation of a cyclotron harmonic spike in microwave-induced resistances in ultraclean GaAs/AlGaAs quantum wells},
	journal = {Physical Review Letters},
	year = {2010},
	doi = {10.1103/PhysRevLett.105.246802},
	author = {Yanhua Dai and R.R. Du and L.N. Pfeiffer and K.W. West}
}
