Killing, Wilhelm: Wilhelmi Killing De determinante quodam disquisitiones mathematicae. In: Index lectionum in Lyceo Regio Hosiano Brunsbergensi per ... instituendarum. Jg.1889
 

Index lectionum in Lyceo Regio Hosiano Brunsbergensi per ... instituendarum... per aestatem ... anni MDCCCLXXXIX.Wilhelmi Killing De determinante quodam disquisitiones mathematicae