@article{doi:10.1302/0301-620X.61B2.285933,
author = {Lorentzon, R and Larsson, SE and Boquist, L},
title = {Extra-osseous osteosarcoma: a clinical and histopathological study of four cases},
journal = {The Journal of Bone & Joint Surgery British Volume},
volume = {61-B},
number = {2},
pages = {205-208},
year = {1979},
doi = {10.1302/0301-620X.61B2.285933},
url = {https://doi.org/10.1302/0301-620X.61B2.285933}
}