The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
@unpublished{Frey:ICAP2018-SUPAF11,
  author       = {M. Frey and A. Adelmann},
  title        = {{C}omputer {A}rchitecture {I}ndependent {A}daptive {G}eometric {M}ultigrid {S}olver for {AMR-PIC}},
  booktitle    = {Proc. of International Computational Accelerator Physics Conference (ICAP'18),
                  Key West, FL, USA, 20-24 October 2018},
  language     = {english},
  intype       = {presented at the},
  series       = {International Computational Accelerator Physics Conference},
  number       = {13},
  venue        = {Key West, FL, USA},
  publisher    = {JACoW},
  address      = {Geneva, Switzerland},
  month        = {Jan.},
  year         = {2019},
  note         = {presented at ICAP2018 in Key West, FL, USA, unpublished},
}