context: He demonstrated that the emission is mostly concentrated in the microwave spectral range.
source: By 1950, Prokhorov was assistant chief of the oscillation laboratory.
reference_original: 1950 war Prochorow stellvertretender Leiter des Oszillationslabors.
reference_flipped: 1950 war Prochorow stellvertretende Leiterin des Oszillationslabors.