Kern, T., Schanda, P., &; Brutscher, B. (2008). Sensitivity-enhanced IPAP-SOFAST-HMQC for fast-pulsing 2D NMR with reduced radiofrequency load. Journal of Magnetic Resonance. Elsevier.https://doi.org/10.1016/j.jmr.2007.11.015 

Schanda, P., &; Brutscher, B. (2006). Hadamard frequency-encoded SOFAST-HMQC for ultrafast two-dimensional protein NMR. Journal of Magnetic Resonance. Elsevier.https://doi.org/10.1016/j.jmr.2005.10.007