<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://roble.intecca.uned.es/tematres/lem/">Cristalografía</topic></authority><related type="narrower"><topic>Óptica cristalográfica</topic></related><related type="other"><topic>Física de sólidos</topic></related><related type="other"><topic>Mineralogía</topic></related><related type="other"><topic>Cristales</topic></related><related type="other"><topic>Metalografía</topic></related><related type="other"><topic>Física del estado sólido</topic></related><related type="other"><topic>Química física</topic></related><related type="broader"><topic>Petrología</topic></related><variant type="other"><topic>Cristalografía geométrica</topic></variant></mads>