ck-url arxiv.org/abs/1505.04243v1
ck-url arxiv.org/abs/1505.07522
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ck-url arxiv.org/abs/1507.01892
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ck-url arxiv.org/abs/1508.01521
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ck-url arxiv.org/abs/1509.05592
ck-url arxiv.org/abs/1509.05592v1
ck-url arxiv.org/abs/1509.05742
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ck-url arxiv.org/abs/1510.01098
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ck-url arxiv.org/abs/1510.01098v2
ck-url arxiv.org/abs/1602.00163
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ck-url arxiv.org/abs/1602.01711
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ck-url arxiv.org/abs/1604.00536
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ck-url arxiv.org/abs/1604.02647
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ck-url arxiv.org/abs/1604.04377
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ck-url arxiv.org/abs/1605.02697