How many papers has Dr. Sergey Buldyrev published in total?
Dr. Sergey Buldyrev has published over 280 papers in refereed journals.
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### Instruction:
How many papers has Dr. Sergey Buldyrev published in total?

### Input: Not applicable

### Response:
Dr. Sergey Buldyrev has published over 280 papers in refereed journals.<|im_end|>