@article{TAM_1976_2_1_a16,
     author = {Adrian Vulpe and Florin Macavei},
     title = {Topological formulations in establishing flexibility matrix for space frames},
     journal = {Theoretical and applied mechanics},
     pages = {131 },
     year = {1976},
     volume = {2},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAM_1976_2_1_a16/}
}