May 12 (SeeNews) - Slovenian banking group NLB, the parent company of Nova Ljubljanska Banka and Serbia's NLB Komercijalna Banka, and Delta Congress Centre, part of Serbian diversified conglomerate Delta Holding, signed an agreement for a 55 million euro ($60 million) loan to finance the reconstruction of the Sava congress centre in Belgrade, NLB Komercijalna Banka said on Friday.