Please answer the following question: Read the bio below and try to give details on yuri burago 's:    - doctoral students     - caption     - fields     - workplaces     - doctoral advisor       - birth date     - name     - image size     - image     - alma mater     Bio: yuri dmitrievich burago -lrb- -rrb- -lrb- born 1936 -rrb- is a russian mathematician . he works in differential and convex geometry .
A:
- doctoral students is grigori perelman anton petrunin- caption is yuri courtesy mfo . d. burago at oberwolfach in 2006 . photo- fields is mathematics- workplaces is st. petersburg state university- doctoral advisor is victor zalgaller aleksandr aleksandrov- birth date is 1936- name is yuri burago- image size is 250px- image is yuri burago.jpg- alma mater is st. petersburg state university