Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Direction of propagation-en#Sense
Direzione di propagazione-it#Sense
Direction de propagation-fr#Sense
Dirección de propagación-es#Sense
Voortplantingsrichting-nl#Sense
Ausbreitungsrichtung-de#Sense