"spectroscopy." . . "Probabilités des transitions atomiques." . . "optics" . . "optics." . "optical spectroscopy" . . "molecular spectra." . . "energy levels." . . "atomic spectra." . . . . "Optical transition probabilities; a representative collection of Russian articles, 1924-1960" . . "Optical transition probabilities : a representative collection of Russian articles, 1924-1960" . . . . "Optical transition probabilities : a representative collection of russian articles 1924-1960" . . "Optical transition probabilities. A representative collection of Russian articles, 1924-1960" . . . . . . . . . . . . "Optical transition probabilities : a representative collection of Russian articles, 1924 - 1960" . . . . . . . . . "Optical transition probabilities : : a representative collection of Russian articles 1924-1960" . . . . . . . . . . . . "Optical transition probabilities a representative collection of Russian articles, 1924-1960"@en . . "Atomisation." . . "Suspensions (chimie)." . . "molecules." . . "spectra." . . "Spectroscopie." . . "atoms." . .