Primary source: ifcardio.org/pdf/italian-heart-journal/2000/07/20000012.pdf
Verified locator: Italian Heart Journal 1(7), 457–463, July 2000. Original full PDF: p. 457 full first byline Ruggero De Paulis and nine-case report; p. 458 Methods explicitly attributes design to RDP and describes the two corrugation orientations, Figures 1–4. Abstract and Results describe visual inspection, transesophageal echocardiography and angiography. PubMed record PMID 10933327 corroborates the publication.
Annals of Cardiothoracic Surgery 8(3), 313–321 (May 2019), DOI 10.21037/acs.2019.04.16. Technical anatomical exposition by the cardiac surgeons named in the primary byline. General considerations and Figures 1–2 distinguish the basal reference, crown-shaped attachment and sinotubular boundary. Figure 1 identifies separate measurement levels in an echocardiographic view.