00519naa#a2200169#i#450# EN\RIOR\bibl\922 20240518212335.6 2309-2653 20131101b2013####ek#y0engy0150####ca RUS RU Political and legal nature of the presidential oath institute (based on comparative analysis of constitutions) Journal article Moscow Publishing Center RIOR 2013 7 с. Journal article local Stoyko Elena riorpub.com