@Article{ Ten15, author = { Tentarelli, Lorenzo }, title = { NLS ground states on metric graphs with localized nonlinearities }, journal = { J. Math. Anal. Appl. }, year = { 2016 }, doi = { 10.1016/j.jmaa.2015.07.065 }, volume = { 433 }, number = { 1 }, pages = { 291-304 }, URL = { http://cvgmt.sns.it/paper/5619/ }, note = { cvgmt preprint} }