doi:10.3850/9789810844554-0086 Hereditary Problems in Long-wall Mining by Free HexagonsP. P. Prochazkaa and Kamila WeiglovaAssociation of Czech Civil Engineers, Prague, Czech Republic, Technical University in Brno. |
doi:10.3850/9789810844554-0086 Hereditary Problems in Long-wall Mining by Free HexagonsP. P. Prochazkaa and Kamila WeiglovaAssociation of Czech Civil Engineers, Prague, Czech Republic, Technical University in Brno. |