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The man who attached a fake collarbomb to Sydney teenager Madeleine Pulver has lodged an appeal against the severity of his sentence.
Paul Douglas Peters was jailed in November last year for at least 10 years for the August 2011 attack.
Peters entered the Pulver family home in Mosman and placed the device around the neck of 18-year-old Madeleine, with a USB stick and ransom note attached.
The Nine Network reports the Court of Criminal Appeal will begin its hearing on the matter this Thursday.
Peters' lawyer hung up on AAP when contacted for comment.