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CHEMICAL PHYSICS LETTERS 1 (1967) 437-440. mamelodi sundowns vs al ahly NORTH-HOLLAND PUBLISHING COMPANY. mamelodi sundowns vs al ahly A:ISTERPAM THE COULOMB-GREEN'S FUNCTION CALCULA'T'ION OF THE SECOND-ORDER INTERACTION OF A HYDROGEN ATOM WITH THE RADIATION FIELD S I VETCHINKIN and S V KCHRISTENKO Institute of Chemical Physics of the Academy of Sciences of tire USSR, Moscow, USSR Received 6 November 1967 The sums over hydrogen spectrum