I. Introduction 237
II. Electron Paramagnetic Resonance in Organic Semiconductors 238
1. EPR Observation of Triplet States of Organic Crystals 238
2. Triplet Excitons in Charge-transfer Complexes and Other Organic Semiconductors 240
3. Activation Energy of Singlet-triplet Transitions and Width of the Forbidden Band 245
III. Nuclear Quadrupole and Nuclear Magnetic Resonance of Organic Semiconductors 247
1. Study of the Nature of Chemical Bonds in Charge-transfer Complexes 247
2. Temperature Dependence of Frequencies 249
3. Temperature Dependence of Relaxation Times 251
IV. Conclusion 252
Bibliography 253

@article{Grechishkin:1967,
	author = {V. S. Grechishkin and N. E. Ainbinder},
	title = {Radiospectroscopy of organic semiconductors},
	publisher = {Physics-Uspekhi},
	year = {1967},
	journal = {Phys. Usp.},
	volume = {10},
	number = {2},
	pages = {237-255},
	url = {https://ufn.ru/en/articles/1967/2/h/},
	doi = {10.1070/PU1967v010n02ABEH003241}
}