Short-lived Quaternary volcanism in the Perşani Mountains (Romania) revealed by combined K-Ar and paleomagnetic data - Hambach, Ulrich; Orleanu, Mihai; Panaiotu, Cristian G.; Panaiotu, Cristina E.; Pécskay, Zoltán; Seghedi, Ioan; Szakács, Alexandru; Tetsumaru, Itaya