@article{DOCMA_2013__18__a39,
     author = {Oprea, Dragos},
     title = {Framed sheaves over treefolds and symmetric obstruction theories},
     journal = {Documenta mathematica},
     pages = {323--342},
     publisher = {mathdoc},
     volume = {18},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DOCMA_2013__18__a39/}
}