@article{IM_1970__11_142052,
     author = {H.B. Jr. Lawson},
     title = {The {Unknottedness} of {Minimal} {Embeddings.}},
     journal = {Inventiones mathematicae},
     pages = {183--187},
     year = {1970},
     volume = {11},
     zbl = {0205.52002},
     url = {http://geodesic.mathdoc.fr/item/IM_1970__11_142052/}
}