References: X

Xanthopoulos, Basilis C @ A Ashtekar, S Chandrasekhar, V Ferrari, R Geroch, S Persides

Xia, Zhihong

Xie, Hong-jun @ M Tsuda

Xu, Chongming @ H Russ

Xu, Qiaozhen

Xue, She-Sheng @ G Preparata

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