论文信息 - On the approximate controllability results for fractional integrodifferential systems of order <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e24" altimg="si4.svg"><mml:mrow><mml:mn>1</mml:mn><mml:mo linebreak="goodbreak" linebreakstyle="after"><</mml:mo><mml:mi>r</m