Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{ARM_1989__25_4_a4, author = {Do\v{s}l\'a, Zuzana}, title = {Singular quadratic functionals and transformation of linear {Hamiltonian} systems}, journal = {Archivum mathematicum}, pages = {223--234}, publisher = {mathdoc}, volume = {25}, number = {4}, year = {1989}, mrnumber = {1188066}, zbl = {0825.34020}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1989__25_4_a4/} }
Došlá, Zuzana. Singular quadratic functionals and transformation of linear Hamiltonian systems. Archivum mathematicum, Tome 25 (1989) no. 4, pp. 223-234. http://geodesic.mathdoc.fr/item/ARM_1989__25_4_a4/