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Erich Gamma
Richard Helm, Ralph Johnson, John Vlissides Erich Gamma
Erich, Helm, Richard, Johnson, Ralph, Vlissides, John Gamma
Erich Gamma Richard Helm Ralph Johnson and John Vlissides
Gamma / Helm / Johnson / Vlissides

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By (author) Richard Helm, By (author) Ralph Johnson, By (author) John M. Vlissides By (author) Erich Gamma