TY - JOUR ID - 125987452 TI - Non linear symmetries of mappings. Existence theorems for a perturbation problem in the presence of symmetries PY - DB - UniCat KW - OPERATEURS NON LINEAIRES KW - OPERATEURS (MATHEMATIQUES) KW - PERTURBATIONS UR - https://www.unicat.be/uniCat?func=search&query=sysid:125987452 AB - ER -