@incollection{,
    author = {Zierer, Hans; Schmidt, Gunther; Berghammer, Rudolf},
    title = {An Interactive Graphical Manipulation System for Higher Objects Based on Relational Algebra},
    editor = {Tinhofer, Gottfried; Schmidt, Gunther},
    booktitle = {},
    series = {Lecture Notes in Computer Science},
    journal = {},
    address = {},
    publisher = {Springer-Verlag},
    edition = {},
    year = {1987},
    isbn = {},
    volume = {246246},
    number =  {},
    pages = {},
    url = {},
    doi = {},
    keywords = {},
    abstract = {},
    note = {},
    institution = {Universität der Bundeswehr München, Fakultät für Informatik, INF 2 - Institut für Softwaretechnologie, Professur: Schmidt, Gunther},
    
    
}