In
the chapter he wrote for UFOs:
Generals, Pilots, and Government Officials Go on the Record
by Leslie Kean, Airline Captain Júlio Guerra relives
his lengthy encounter with a highly active UFO while serving
as a flight instructor for the Portugese Air Force in
1982. The object circled his small airplane, and that
of two other Air Force pilots, for twenty minutes, while
they communicated with ground control. Guerra describes
some harrowing moments when he was extremely close to
the UFO, and provides his original drawing of the elliptical
object.
Click
here
for the Alenque, Portugal UFO Encounter
Source:
http://ufosontherecord.com/contributor-photos/