A block deal in Sistemi za Teleobrabotka communications equipment company boosted turnover on the Bulgarian Stock Exchange to BGN 229,632 (USD 113,231) on Tuesday, from BGN 113,498 on Monday. The block deal included 71,342 shares in Sistemi za Teleobrabotka selling at BGN 3 per share, which made 93% of the turnover. In real-time trading, steel mill Kremikovtzi traded at BGN 0.75 per share, up 15.38% from previous trading on February 24, and oil refinery Lukoil-Neftochim at BGN 10.4 per share, up 4.5% from previous deals on Monday. Trading volume rose to 75,490 shares from Monday's 17,270