(NpRO oLXGU kOBILQNSXKU (B:s (NNOW)QÆ MATERÆALI(B; (NROZDUMI(B; (NZNAHÆDKI (B/s)E - (NwOZN@K(B, (Nw(B. (No(B.s ((NkI)QÇW (B:s)E (NdN)QÆPRO(B,s)E, 1983)