Luís Mendonça Alves, Paulo Firme Martins, Tiago Pardal
"Technological process for the manufacturing of thin‐walled hollow spheres from commercially available tube",
Submitted to INPI in January 2008


L.M. Alves a, T.C.D. Pardal b, P.A.F. Martins
"Forming of thin-walled hollow spheres using sacrificial polymer mandrels"; International Journal of Machine Tools & Manufacture 49 (2009) 521–529;
December 23; 2008