by Petre, Ioan-Radu
Published in Analele ştiinţifice ale Universităţii "Ovidius" Constanţa. Seria Matematică (01.06.2014)

by Petre, Ioan-Radu
Published in Mathematical notes (Miskolci Egyetem (Hungary)) (2015)

by Páles, Zsolt, Petre, Ioan-Radu
Published in Acta mathematica Hungarica (01.07.2013)

by Petre, Ioan-Radu
Published in The journal of nonlinear sciences and its applications (07.08.2014)

by Petre, Ioan Radu, Petrusel, Adrian
Published in Electronic journal of qualitative theory of differential equations (01.10.2012)