TY - JOUR AU - Došlá, Zuzana TI - Singular quadratic functionals and transformation of linear Hamiltonian systems JO - Archivum mathematicum PY - 1989 SP - 223 EP - 234 VL - 25 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ARM_1989__25_4_a4/ LA - en ID - ARM_1989__25_4_a4 ER -