Atomic energy levels as derived from the analyses of optical spectra : the spectra of molybdenum, technetium, ruthenium, rhodium, palladium, silver, cadmium, indium, tin, antimony, tellurium, iodine, xenon, cesium, barium, lantanum - hafnium, tantalum, tungsten, rhenium, osmium, iridium, platinum, gold, mercury, thallium, lead, bismuth, polonium, radon, radium, and actinium / vol. 3. - Moore, Charlotte E. (Circular of the National Bureau of Standards ;, 1958)