RT Journal Article ID 4bb9165c405c74d3 A1 Makovetskii, D. N. T1 Microwave Valve Properties of a Nonequilibrium Paramagnetic Related to Spatial Symmetry Breaking of the Inversion States of Active Impurity Ions JF Telecommunications and Radio Engineering JO TRE YR 1998 FD 1998-04-01 VO 52 IS 4 SP 66 OP 70 AB PB Begell House LK https://www.dl.begellhouse.com/journals/0632a9d54950b268,37c8a4754af4ffc6,4bb9165c405c74d3.html