@article{Makovetskii_1998 author = {D. N. Makovetskii}, title = {Microwave Valve Properties of a Nonequilibrium Paramagnetic Related to Spatial Symmetry Breaking of the Inversion States of Active Impurity Ions}, journal = {Telecommunications and Radio Engineering}, issn = {0040-2508}, year = {1998}, volume = {52}, number = {4}, pages = {66--70} }