@unpublished{urech:hal-01286455,
TITLE = {On homomorphisms between Cremona groups},
AUTHOR = {Urech, Christian},
URL = {https://hal.science/hal-01286455},
NOTE = {working paper or preprint},
YEAR = {2016},
MONTH = Mar, KEYWORDS = {Cremona group + birational geometry + group theory + algebraic group actions},
PDF = {https://hal.science/hal-01286455/file/paper_draft_short5.pdf},
HAL_ID = {hal-01286455},
HAL_VERSION = {v1},
}