доверенное лицо(в тексте доверенности Leonid Dzhepko); поверенный(A power of attorney (POA) or letter of attorney in common law systems or in civil law systems is an authorization to act on someone else's behalf in a legal or business matter. The person authorizing the other to act is the principal, granter or donor (of the power), and the one authorized to act is the agent, the attorney-in-fact, or in many Common Law jurisdictions, simply the attorney. wiki Alexander Demidov); лицо, действующее в суде по доверенности(не являющееся адвокатом); доверенный; представитель по доверенности(The person authorizing the other to act is the principal, granter or donor (of the power), and the one authorized to act is the agent, the attorney-in-fact, or in many Common Law jurisdictions, simply the attorney. wiki Alexander Demidov); по доверенности(В тексте договора в подписном блоке после фамилии)