  Echocardiography is a non-invasive diagnostic tool which can be performed on
children of all ages including foetuses and new-borns, due to the fact that no
radiation is involved. No historical bibliometric study or influential papers
in paediatric echocardiography has been performed yet, so our study was aimed
to close this gap. References Publication Years Spectrography (RPYS), more
precisely CitedReferenceExplorer (CRE) software tool was employed to achieve
this aim. We identified 35 influential papers and validation showed that both,
the RPYS method and CRE tool performed satisfactorily.
