@article{SIGMA_2013_9_a11,
     author = {Frank B. Estabrook},
     title = {Specialized {Orthonormal} {Frames} and {Embedding}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2013},
     volume = {9},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2013_9_a11/}
}