@book { EngelundMensch,
    title = "Engel und Mensch",
    subtitle = "Studien zu Rilkes Duineser Elegien",
    author = "Balasundaram {Subramanian}",
    year = "1986",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1073643"
}