@book { GeoparksandGeoTourisminIran,
    title = "Geoparks and Geo-Tourism in Iran",
    author = "Andreas {Dittmann}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b11656",
    url = "https://www.peterlang.com/document/1061466"
}