APA Style
      Mueller, C. et al (2019).
    Mining Goes Digital: Proceedings of the 39th international Symposium ‘Application of Computers and Operations Research in the Mineral Industry' (APCOM 2019), Wroclaw, Poland, 4-6 June 2019 .
    :
  .
  
MLA Style
      Mueller, Christoph. et al.
    "Mining Goes Digital: Proceedings of the 39th international Symposium ‘Application of Computers and Operations Research in the Mineral Industry' (APCOM 2019), Wroclaw, Poland, 4-6 June 2019".
    
    :
  ,
  2019.
  Text.