In a new San Francisco Fed Economic Letter, Atif Mian and Amir Sufi investigate this hypothesis.

在一封新的旧金山联邦储备银行经济信中，At if Mian与Amir Sufi调查了这一假说。

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Those issues may be addressed in upcoming talks, according to South Sudan's spokesman Atif Kiir.

CNN: Sudan and South Sudan sign partial agreement

The last letter Mercer received from his daughter said she expressed "disappointment and dismay" that they had not heard from their Pakistani-based lawyer, Atif Ali Khan, in three weeks.

CNN: Taliban move detained Western aid workers

"We were left with no choice but to suspend our direct bilateral talks with Sudan, " said Atif Kiir, the spokesman for Juba's delegation at the talks in Addis Ababa.

BBC: South Sudan scraps direct border talks with Khartoum