1. Reliable Proton Nuclear Resonance Shielding Values by “Internal Referencing” with Tetramethyl-silane
2. G. V. D. TIERS, Tables of τ-values for a Variety of Organic Compounds (1958, unpublished). This table is the first extensive collection of reliable shielding values that seems to make data processing worthwhile. We are grateful to Dr. Tiers for making these important data available.
3. J. S. WAUGH, F. W. DOBBS, The Ten Spin System of Isobutane (1959, preprint).