@article{01533627, title = {Exponential separation in 4-manifolds.}, journal = {Geometry \& Topology}, volume = {4}, year = {2000}, pages = {397-405}, doi = {10.2140/gt.2000.4.397}, zbl = {0957.57015}, language = {en}, url = {http://dml.mathdoc.fr/item/01533627} }
Krushkal, Vyacheslav S. Exponential separation in 4-manifolds.. Geometry & Topology, Tome 4 (2000) pp. 397-405. doi : 10.2140/gt.2000.4.397. http://gdmltest.u-ga.fr/item/01533627/