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Doctor of sciences in physics and mathematics

higher doctoral degree in the Soviet Union and post-Soviet states

Pronunciation
/ˈdɑktər əv ˈsaɪənsəz ɪn ˈfɪzɪks ænd mæθəˈmædɪks/
/ˈdɒktə əv ˈsʌɪənsɪz ɪn ˈfɪzɪks ənd maθəˈmatɪks/