<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31308575</termId><termName>flutter</termName><termType>PT</termType><termNote><![CDATA[ An undesired oscillation in a part of a machine or structure under stress. ]]></termNote><termCreatedDate>2026-03-30 20:23:04</termCreatedDate><relation><relationType>BT</relationType><termId>31299871</termId><termName>structural analysis concepts</termName><termType>PT</termType></relation></term>  </Zthes>