Pervouchine D. D. Invariants and orbits of square matrix pencils // Deponent VINITI RAN No446-B2002, March 12, 2002.
Pervushin D. D. Invariants and orbits of the standard $SL_4({\mathbb C})\times SL_4({\mathbb C})\times SL_2({\mathbb C})$-module // Izvesiya RAN. Ser. matem., 64(5), 133–146, 2000.
Pervouchine D. D. On the closures of the orbits of fourth order matrix pencils // Izvesiya RAN. Ser. matem., 66(5), 183–192, 2002.
D. D. Pervouchine, “On the closures of orbits of fourth order matrix pencils”, Izv. RAN. Ser. Mat., 66:5 (2002), 183–192; Izv. Math., 66:5 (2002), 1047–1055
D. D. Pervouchine, “Invariants and orbits of the standard $(\mathrm SL_4(\mathbb C)\times\mathrm SL_4(\mathbb C)\times\mathrm SL_2(\mathbb C))$-module”, Izv. RAN. Ser. Mat., 64:5 (2000), 133–146; Izv. Math., 64:5 (2000), 1003–1015