Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field Subject Field/6411
Is Reference of Réfraction acoustique-fr#Sense
Brydning af lydbølger-da#Sense
Rifrazione acustica-it#Sense
Sound refraction-en#Sense
Geluidsrefractie-nl#Sense
Geluidsbreking-nl#Sense
Schallbrechung-de#Sense