Merge branch 'publications-add-dois' into 'master'

_fc-publications/aorai/2009-afadl-gs.md

_fc-publications/c2s/2016-scam-bkll.md

_fc-publications/c2s/2017-lifo-blk.md

_fc-publications/c2s/2017-vpt-blk.md

_fc-publications/celia/2011-pldi-bdes.md

_fc-publications/celia/2012-vmcai-bdes.md

_fc-publications/cfp/2017-lopstr-as.md

_fc-publications/cost/2012-fmics-amarg.md

_fc-publications/e-acsl/2013-rv-kps.md

_fc-publications/e-acsl/2013-rv-ks.md

_fc-publications/e-acsl/2013-sac-dks.md

_fc-publications/e-acsl/2015-jfla-jks.md

_fc-publications/e-acsl/2017-ismm-vsk.md

_fc-publications/e-acsl/2017-rv-vksa.md

_fc-publications/e-acsl/2017-rvcubes-skv.md

_fc-publications/e-acsl/2018-hilt-lksl.md

_fc-publications/e-acsl/2018-tap-vks.md

_fc-publications/e-acsl/2020-rv-kms.md

_fc-publications/e-acsl/2020-tap-lkls.md

_fc-publications/e-acsl/2021-vmcai-vjks.md