TY  - RPRT
TI  - On the existence of maximum likelihood estimates for presence-only data
AU  - Trevor J. Hefley
AU  - Mevin Hooten
PY  - 2015
DO  - 10.1111/2041-210x.12340
UR  - https://pubs.usgs.gov/publication/70173664
ID  - 70173664
ER  -