@article{AM2_1982__24_136938,
     author = {Ian Anderson},
     title = {Triples, current graphs and biembeddings.},
     journal = {Aequationes mathematicae},
     pages = {230--242},
     year = {1982},
     volume = {24},
     zbl = {0519.05025},
     url = {http://geodesic.mathdoc.fr/item/AM2_1982__24_136938/}
}