@book { ThePostImperativeNegativeVariationinSchizophrenicPatientsandHealthySubjects,
    title = "The Post-Imperative Negative Variation in Schizophrenic Patients and Healthy Subjects",
    author = "Christoph {Klein}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1083331"
}