@book{486207, author = {Claro, Miguel and Coston, John}, title = {Dark sky Alqueva}, publisher = {Centro Atlântico}, year = {2015}, address = {V. N. Famalicão}, edition = {1ª ed}, url = {http://rnod.bn.pt/ImagesBN/winlibimg.aspx?skey=&doc=1915620&img=69187&save=true} }