Mel’nichenkoIP, Plaksa SA. Reduction of the principal biharmonic problem for a quadrant to nonsingular integral equations. Ukr. Mat. Zhurn. [Internet]. 1995Jun.25 [cited 2024Jul.27];47(6):775–784. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/5471