Where was Dr. Sergey Buldyrevs Ph.D. obtained from?
Dr. Sergey Buldyrev obtained his Ph.D. in physics and mathematics from SaintPetersburg State University, Russia.
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### Instruction:
Where was Dr. Sergey Buldyrevs Ph.D. obtained from?

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### Response:
Dr. Sergey Buldyrev obtained his Ph.D. in physics and mathematics from SaintPetersburg State University, Russia.<|im_end|>