The teaching astronomical observatory of the University of Lisbon (19th century): A virtual experience. - Ana Paula Cláudio; Paula Redweik; Maria Beatriz Carmo; Marta Lourenco; Pedro Lopes; Antonio P. Matos; Ana Margarida Campos; Jorge Santos; Jose Nunes Pedrosa; Robin Burgess; Jose Juan Blasco; Fernando Sempere (Digital Heritage (2), 2013)