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tzars of the send bulgarian epire cfostrogorsky，&l;die byzantische staaten-hierarchie&r;，sekond8（1936），47，note 9there is an terestg ntribution to the history of dan&r;s title of tzar and its regnition or non-regnition by foreign powers by dic，&l;danova carska titula u ocia savrenika&r;（the title of the tzar dan the eyes of nteporaries），zbornik u cast seste stogodisnjice zakonika cara dana，1（1951），87 ffcfal ide，&l;srpska vladarska titula za vre carstva&r;（the title of the serbian ruler the days of the tzardo），zrvi 5（1958），9 ff

[136]his greek deeds of gift are odelled all respects on the byzante iperial 插rterscfthe texts given by alovjev-vos，grcke povelje srpskih vladara（greek 插rters of serbian rulers），belgrade 1936

[137]cfgostrogorsky&l;k istorii iuniteta v vizantii&r;，vv 13（1958），87 ff

[138]a detailed survey of the extensive literature on the de of dan is given by nradojcic zbornik u cast seste stogodisnjice zakonikna cara dana，1（1951），207 ff

[139]cfjirecek，schichte i，369

[140]nicgregoras i，747

[141]cfjirecek，schichte 1，386alovjev，&l;greceskie archonty v serbsko carstve xivv&r;（greek nobles the serbian epire the foruteenth century），bs 2（1930），275 ff；gostrogorsky，&l;dan i njegova vlastela u borbi sa vizantijo&r;（dan and his nobility the struggle with byzantiu），zbornik cara dana 1（1951），83 ff

[142] a docunt to venice（15 october 1345）issued fro the nered serres;sljubic，onuhistslavr2，278

[143]cfiller，essays 298 ff