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3. Composite pulses constructed by a recursive expansion procedure;M H Levitt;J. Magn. Reson,1983
4. Composite Pulses without phase distortion;R Tycho;J. Magn. Reson,1985
5. Composite Pulses;M H Levitt;Prog. Nucl. Magn. Reson. Spectrosc,1986