@book { TheMutualAssistanceandSolidarityClauses,
    title = "The Mutual Assistance and Solidarity Clauses",
    author = "Antonio-Maria {Martino}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-04341-9",
    url = "https://www.peterlang.com/document/1048528"
}