@article{GDZPPN002298317, title = {The Intersection Multiplicity of a Connected Component}, journal = {Mathematische Annalen}, volume = {174}, year = {1967}, pages = {238-246}, zbl = {0148.41704}, url = {http://dml.mathdoc.fr/item/GDZPPN002298317} }
Boer, J.H. de. The Intersection Multiplicity of a Connected Component. Mathematische Annalen, Tome 174 (1967) pp. 238-246. http://gdmltest.u-ga.fr/item/GDZPPN002298317/