UM OAYK NOUMBA. (2004). MODEL FOR CALCULATING INTERCONNECTION COSTS IN TELECOMMUNICATIONS - CD. WORLD BANK.
Lua i Stíl Chicago (17ú heag.)UM OAYK NOUMBA. MODEL FOR CALCULATING INTERCONNECTION COSTS IN TELECOMMUNICATIONS - CD. WASHINGTON: WORLD BANK, 2004.
Lua MLA (9ú heag.)UM OAYK NOUMBA. MODEL FOR CALCULATING INTERCONNECTION COSTS IN TELECOMMUNICATIONS - CD. WORLD BANK, 2004.
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