Sobolev regularity of the canonical solutions to <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mover accent="true"><mml:mi>∂</mml:mi> <mml:mo>¯</mml:mo></mml:mover></mml:math> on product domains
Comptes rendus. Mathématique/Comptes rendus. Mathématique