Lithuanian Mathematical Journal
Lithuanian Mathematical Journal > 2000 > 40 > 4 > 310-328
Lithuanian Mathematical Journal > 2000 > 40 > 4 > 341-351
Lithuanian Mathematical Journal > 2000 > 40 > 4 > 297-309
Lithuanian Mathematical Journal > 2000 > 40 > 4 > 329-340
Lithuanian Mathematical Journal > 2000 > 40 > 4 > 379-388
Lithuanian Mathematical Journal > 2000 > 40 > 4 > 364-378
Lithuanian Mathematical Journal > 2000 > 40 > 4 > 352-363
Lithuanian Mathematical Journal > 2000 > 40 > 4 > 389-401