82,2001/27,10.4.01,L107, 18.4.2001 p.10,Measures to be taken against the emission of gaseous and particulate pollutants from compression- ignition engines for use in vehicles, and the emission of gaseous pollutants from positive-ignition engines fuelled with natural gas or liquefied petroleum gas for use in vehicles,88/77 as amended by 91/542 and 1999/96,