books

Books about Helvoort:

booksSDH/SONET Explained in Functional Models: Modeling the Optical Transport Network 1st Edition by Helvoort, Huub... (Oct 3, 2005)

wiki

Wiki information Helvoort:

Jeff van Helvoort
Musician, Musician, Person

Jeff van Helvoort is a musical artist.

Peter van Helvoort
Musician, Person, Musician

Peter van Helvoort is a musical artist.