TY - JOUR AU - E. V. Dybkova TI - Form nets and the lattice of upper-diagonal subgroups of the symplectic group over a~field of characteristic~$2$ JO - Algebra i analiz PY - 1998 SP - 113 EP - 129 VL - 10 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/AA_1998_10_4_a3/ LA - ru ID - AA_1998_10_4_a3 ER -