what is the scientist whose doctoral students are vladimir nikolayevich beklemishev and vladimir nikolayevich beklemishev ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_doctoralStudent dbr_Vladimir_Nikolayevich_Beklemishev sep_dot var_uri dbo_doctoralStudent dbr_Vladimir_Nikolayevich_Beklemishev brack_close