@book { PriceElasticity, title = "Price Elasticity", subtitle = "Research on Magnitude and Determinants", author = "Evelyn {Friedel}", year = "2015", publisher = "Peter Lang Verlag", address = "Berlin, Germany", doi = "10.3726/978-3-653-04294-8", url = "https://www.peterlang.com/document/1048042" }