HAT-cycle power plant study for high efficiency : technical and economic features of the HAT-cycle with natural gas and coal gas firing / by: D. SchipperBehaviour of overburden rock / by D. Schipper, M.I. Chem ; [ed.: D. Douwes]General overview of studies on rock behaviour and mass and heat transfer / D. Schipper, M.I. Chem ; [ed.: D. Douwes]Heat and mass transfer / D. Schipper, M.I. Chem ; [ed.: D. Douwes]