Non-Latin script reference not evaluated.

Belbruno, Edward. Astrodynamics, space missions, and chaos, 2004: ECIP t.p. (Pini Gurfil)

Neḳudat magoz, 2015: t.p. (פיני גורפיל = Pini Gurfil) t.p. verso (Pini Gurfil [in rom.]) cover page 4 (born 1971 in Kishinev Moldova, immigrated to Israel in 1973; Professor of the faculty of Aerospace Engineering at the Technion, Israel Institute of Technology where he his earned Ph.D in Aerospace Engineering)