@misc{kemper,
  author        = {Gregor Kemper},
  title         = {Lecture notes of Algebra},
  month         = {04},
  year          = {2020},
  howpublished  = "\url{https://www.groups.ma.tum.de/fileadmin/w00ccg/algebra/people/kemper/lectureNotes/Algebra.pdf}"
}
