Org. Magn. Reson.-1977.- Vol.9.- No.2.- P.75–79
Conformational analysis of N,N-diisopropylamides by combined use of n.m.r. lanthanide-induced shifts and conformational energy calculations (pages 80–89)
Graham L.L., Vanderkooi G. and Getz J.A.
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dx.doi.org/10.1002/mrc.1270090207