@article{02139857, title = {An invariant of link cobordisms from Khovanov homology.}, journal = {Geometry \& Topology}, volume = {8}, year = {2004}, pages = {1211-1251}, doi = {10.2140/agt.2004.4.1211}, zbl = {1072.57018}, language = {en}, url = {http://dml.mathdoc.fr/item/02139857} }
Jacobsson, Magnus. An invariant of link cobordisms from Khovanov homology.. Geometry & Topology, Tome 8 (2004) pp. 1211-1251. doi : 10.2140/agt.2004.4.1211. http://gdmltest.u-ga.fr/item/02139857/