1. Berski , S., Banaszek , G., Dyja , H.: Записки Горного института. 170, 169-172 (2007)
1. Berski , S., Banaszek , G., Dyja , H.: Theoretical analysis of metal flow velocity of bimetallic rod during extrusion process. Journal of Mining Institute. 170, 169-172 (2007)