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↑ "US SEC: Form 10-K Shake Shack Inc" . ??????? ???? ? ????? ?????? ?????? . Archived from the original on May 5, 2018 . Retrieved June 27, 2018 .
↑ McCann, K.; Tanzilo, R. (2016). Milwaukee Frozen Custard . American Palate. Arcadia Publishing Incorporated. p. 121. ISBN 978-1-62585-717-0 . Retrieved November 14, 2017 .

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