Giessner-Prettre C, Pullman B
C R Acad Hebd Seances Acad Sci D. 1976 Sep 27;283(6):675-7.
Intermolecular nuclear shielding values for protons, due to the ring-current effect, are computed for a plane parallel to and 3.4 A above the phenoxazone ring of actinomycin, ethidium, proflavin and quinacrine.