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Kotonya, Gerald, SOMMERVILLE. IAN. (1997). Requirements engineering ; processes and techniques . New York: John Wlly & Sns.

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Kotonya, Gerald, SOMMERVILLE. IAN. Requirements engineering ; processes and techniques. New York: John Wlly & Sns, 1997. Text.

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Kotonya, Gerald, SOMMERVILLE. IAN. Requirements engineering ; processes and techniques. New York: John Wlly & Sns, 1997. Text.

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Kotonya, Gerald, SOMMERVILLE. IAN. Requirements engineering ; processes and techniques. New York: John Wlly & Sns, 1997. Print.