RT Journal Article SR Electronic A1 Plíhal, J. A1 Pípa, M. A1 Roček, P. T1 Technical Notes on GDF, GEOGRAPHIC DATA FILES Information support for the visually impaired Project R&D MD JF Transactions on Transport Sciences YR 2008 VO 1 IS 1 SP 49 OP 50 DO 10.5507/tots.2008.007 UL https://tots.upol.cz/artkey/tot-200801-0007.php AB