@book { HansMichaelGeigerInformationalEfficiencyinSpeculativeMarketsATheoreticalInvestigation,
    title = "Hans-Michael Geiger- Informational Efficiency in Speculative Markets- A Theoretical Investigation",
    author = " {Hans-Michael Geiger}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b14075",
    url = "https://www.peterlang.com/document/1068601"
}