TY  - BOOK
AU  - GRAY William G
AU  -  GRAY Genrtha A
TI  - Introduction to environmental modelling
SN  - 9781107571693
U1  - "U:(G:55):(B), Q7" 
PY  - 2017///
CY  - "U.K,"
PB  - "Cambridge University Press,     "
ER  -