Killing, Wilhelm: ... W. Killing Observationes ad theoriam transformationum continuarum pertinentes. In: Index lectionum in Lyceo Regio Hosiano Brunsbergensi per ... instituendarum. Jg.1886
 

Index lectionum in Lyceo Regio Hosiano Brunsbergensi per ... instituendarum... per aestatem ... anni MDCCCLXXXVI.... W. Killing Observationes ad theoriam transformationum continuarum pertinentes