This website has been developed by Essencia Communicatie, The Hague, the Netherlands.
Unless otherwise indicated: Robert de Voogd, Rotterdam, and Louis Haagman, Schiedam, the Netherlands.
Copyright on this website is held by the Allegro-research team. Some of the content shown on this website is protected by copyright. Permission from the copyright owner or his or her legal representative is needed if these works are to be used in any other way than viewing them on this website.