@book { ExtendedPerformanceEvaluationBasedonDEA,
    title = "Extended Performance Evaluation Based on DEA",
    author = "Ludmila {Neumann}",
    year = "2017",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b11297",
    url = "https://www.peterlang.com/document/1113327"
}