... mot so kh ai niern va ket qua lien quan, bandoc neu din quan tam chi tiethonthl xem[1,2,4],D!nh nghia 1.ChoR (AI, A2, ' , , ,An)lamothro c do quan h~, choX vaYlacact~p concua{AI, ... qua ve phu dang vanh va cackhainiern lien quan, nhiingketquanaylaco' s6-cuaThuat toan THV[3]dochungtoi dexuat,K{ hie u: Quan h~R tren t~pthudctinh Udiro'cki ... ,.r,< ', I " '" , MQT SOVAN DE PHU DI;\NG VANH VA CAC KHAINI~MLIEN QUAN PHAM QUANG TRUNGAbstract, Maier[2]gave concept aboutannular coverin1983,and applied it in...