DIAGRAM TECHNIQUE FOR SPIN-OPERATORS AND ITS APPLICATIONS TO SOME PROBLEMS OF FERROMAGNETISM Yu. A. IZYUMOV, F. A. KASSAN-OGLY et Yu. N. SKRYABINJ. Phys. Colloques, 32 C1 (1971) C1-86-C1-88DOI: https://doi.org/10.1051/jphyscol:1971125
