@article{MZ_1993__214_1_174592,
     author = {Ying-Qing Wu},
     title = {Minimally knotted embeddings of planar graphs.},
     journal = {Mathematische Zeitschrift},
     pages = {653--658},
     publisher = {mathdoc},
     volume = {214},
     number = {1},
     year = {1993},
     zbl = {0789.57006},
     url = {http://geodesic.mathdoc.fr/item/MZ_1993__214_1_174592/}
}