alexander owen del pieroat www.researchgate.net Gianpietro Del Piero. and Rubens Sampaio 2 1 . - ResearchGate Gianpietro Del Piero. and Rubens Sampaio 2. I Istituto di Meccanica . O. Del Piero and R. Sampaio . ideas developed in discussions with D. R. Owen. one of us was led to . and of the Alexander von Humboldt Stiftung for the second author.