System of national standards for quality of telecommunication services. Quality of service of cellular mobile communication. Normative values for quality indices
Uniform provisions concerning the approval of compression ignition (C.1.) and natural gas (N.G.) engines as well as positive-ignition (P.1.) engines fuelled with liquefied petroleum gas (LPG) and vehicles equipped with C.1 and N.G. engines and P.1. engines fuels with LPG, with regard to the emissions of pollutants by the engine
