@book { ObesityinEurope,
    title = "Obesity in Europe",
    subtitle = "Young people‘s physical activity and sedentary lifestyles",
    author = "Wolf-Dietrich {Brettschneider} and Roland {Naul}",
    year = "2007",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1103376"
}