@article {33827,
	title = {Hard streaks, boulders, thin seams and soft benches : how can BWE cope, Proceedings of the Second Symposium on the Mining Techniques, New Mexico, April 22, 1983, Socorro, New Mexico},
	year = {1983},
	note = {cited Krzanowski thesis, 1984},
	author = {Weise, H.}
}
