. . . . . . . . . . "Operator Techniques in Atomic Spectroscopy"@en . . "Operatortechnik" . . . . . . . . . . . . "Racah-Koeffizient" . . . . . . . . . . . . "Operator techniques in atomic spectroscopy" . "Operator techniques in atomic spectroscopy"@en . . . . . . "Operator techniques in atomic spoectroscopy" . . "Electronic books"@en . . . . . . . . . . . . . . . . . . . . . . . "Operator techniques in atomic spectroscopy : with a new preface by the author"@en . . "Operator techniques in atomic spectroscopy : with a new preface by the author" . . "Operator techniques in atomic spectrscopy" . . . . . . . . . . . "Atomic spectroscopy Mathematics." . . "Operatoralgebra." . . "Spectroscopie atomique Mathématiques." . . "Atomspektroskopie." . . "Groupes continus." . . "Operator." . . "Atomspektrum." . . "Atomes Technique." . . "Calculus, Operational." . . "Atomaire spectrometrie." . . "atoms" . . "atoms." . "Tensoren." . . "Continuous groups." . . "Physique mathématique." . . "Espectroscopía atómica." . . "Spectroscopie atomică." . . "Gruppentheorie." . . "MATHEMATICS / Group Theory" . . "Operatoren." . . "Spectre lumineux." . . "Mathematische fysica." . . "Wiskundige methoden." . . "Chemische structuur." . . "Laplace, Transformation de." . . "Calcul symbolique." . . "fysicochemie." . . "Calcul symbolique Analyse mathématique." . . . . "Moment angulaire." . . "Atoomfysica." . . "molecules" . . "molecules." . "SCIENCE / Physics / Quantum Theory" . .