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by Taylor, Michael E.
by Nevalinna, Rolf; Paatero, Veikko; Kovari, T.; et al.
by McGehee, O. Carruth
by Hormander, L.
by Priestley, H. A.
by Tutschke; Wolfgang
by William D. Dupont
by D'Angelo, John P.
by Burckel, R. B.