Reference:

Kai Puolamäki. On spontaneously broken R-parity. Master's thesis, University of Helsinki, 1996.

Suggested BibTeX entry:

@mastersthesis{Puolamaki96msc,
    author = {Kai Puolam\"aki},
    school = {University of Helsinki},
    title = {On Spontaneously Broken {R}-Parity},
    year = {1996},
}