Atsarkin, V. and A. Kessenikh, Dynamic Nuclear Polarization in Solids: The Birth and Development of the Many-Particle Concept. Appl. Magn. Reson.: p. 1-13.
http://dx.doi.org/10.1007/s00723-012-0328-7
A brief review is presented on historical aspects of the dynamic nuclear polarization (DNP) research in 1960–1970s of the last century. Much attention is given to development of the many-particle approach, from pioneering studies of the 3-spin electron–nuclear cross effect to development of spin-temperature concept and thermal mixing mechanism of DNP in solids. Applicability of different models to modern DNP data is briefly discussed.