QCD studies and determination of αs in e+e− collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" altimg="si1.gif" overflow="scroll"><mml:mrow><mml:mstyle scriptlevel="-2"><mml:msqrt><mml:mstyle scriptlevel="0"><mml:mi>s</mml:mi></mml:mstyle></mml:msqrt></mml:mstyle><mml:mo>=</mml:mo><mml:mn>161</mml:mn><mml:mo>GeV</mml:mo></mml:mrow></mml:math> and 172 GeV
Physics letters. B