From a isbn or a doi get the bibtex

get_bibtex.sh

#!/bin/bash

str_utilisation="$0 (doi|isbn) <value>"
if [ "$#" -ne 2 ];then
    echo ${str_utilisation}
    exit 1
fi

if [ "$1" == "doi" ];then
    doi_raw=$2
    curl -G --data-urlencode "id=$doi_raw" "http://www.doi2bib.org/doi2bib"
elif [ "$1" == "isbn" ];then
    isbn=$2
    curl -silent "http://www.ottobib.com/isbn/${isbn}/bibtex" | perl -l -0777 -ne 'print $1 if /<textarea.*?>\s*(.*?)\s*<\/textarea/si'
else
    echo ${str_utilisation}
fi

echo ""

./get_bibtex.sh doi 10.1063/1.4903985
@article{Scemama_2014,
    doi = {10.1063/1.4903985},
    url = {http://dx.doi.org/10.1063/1.4903985},
    year = 2014,
    month = {dec},
    publisher = {{AIP} Publishing},
    volume = {141},
    number = {24},
    pages = {244110},
    author = {A. Scemama and T. Applencourt and E. Giner and M. Caffarel},
    title = {Accurate nonrelativistic ground-state energies of 3d transition metal atoms},
    journal = {J. Chem. Phys.}
}