@article{GDZPPN002541742, title = {The middle graph of a hypergraph}, journal = {Revista colombiana de matematicas}, volume = {24}, year = {1990}, pages = {97-102}, zbl = {0757.05085}, url = {http://dml.mathdoc.fr/item/GDZPPN002541742} }
Marcu, Danut. The middle graph of a hypergraph. Revista colombiana de matematicas, Tome 24 (1990) pp. 97-102. http://gdmltest.u-ga.fr/item/GDZPPN002541742/