Universal series by trigonometric system in weighted<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="E1"><mml:mrow><mml:msubsup><mml:mi>L</mml:mi><mml:mi>μ</mml:mi><mml:mn>1</mml:mn></mml:msubsup></mml:mrow></mml:math>spaces
International journal of mathematics and mathematical sciences