TY - JOUR AU - Patrik Knopf AU - Chun Liu TI - On second-order and fourth-order elliptic systems consisting of bulk and surface PDEs: Well-posedness, regularity theory and eigenvalue problems JO - Interfaces and free boundaries PY - 2021 SP - 507 EP - 533 VL - 23 IS - 4 UR - http://geodesic.mathdoc.fr/articles/10.4171/ifb/463/ DO - 10.4171/ifb/463 ID - 10_4171_ifb_463 ER -