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Agile Software Requirements by Dean Leffingwell Scaling Software Agility by Dean Leffingwell Managing Software Requirements by Dean Leffingwell SAFe 4.5 Reference Guide by Dean Leffingwell SAFe® 4.0 Reference Guide by Dean Leffingwell Implementing SAFe 4.0 by Dean Leffingwell ソフトウェア要求管理―新世代の統一アプローチ by Dean Leffingwell Agile Software Requirements by Dean Leffingwell Scaling Software Agility by Dean Leffingwell [Scaling Software Agility by Dean Leffingwell


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