The parents of teenager Ana Kriégel have said "justice has been served for Ana" but for them "forever is not long enough".
Geraldine and Patric Kriégel read a short statement outside the court after the sentencing of two boys convicted of murdering their daughter in May 2018.
Ms Kriégel thanked all the people who had given them support whom she said had kept them going.
Mr Kriégel said: "Justice has been served for Ana. The judge has decided on the sentence, that duty lies with him alone.
He said: "for our part, we can only say that forever is not long enough.
"Please remember Ana and keep her in your hearts somewhere."
Mr Justice Paul McDermott sentenced the boy referred to in court as Boy A to life in detention, his sentence will be reviewed in 12 years.
His co-accused, referred to as Boy B, was sentenced to 15 years for his part in the murder, with his sentence being reviewed after eight years.
The boys were just 13 years old when they killed the schoolgirl in a derelict house in Lucan in May 2018. The first boy also violently sexually assaulted her.
"We would like to express our extreme gratitude to Mark O'Neill and his team and An Garda Síochána who have put everything they had into finding those responsible for Ana's murder, Siobhan McIntyre, our liaison officer, for holding the family up through all of this pain, the legal team, the jury and the judge, the media for being so understanding, the victim support unit, our family, our friends and our neighbours," she said.
"And thank you to all of the wonderful people out there that supported us and kept us going."
Garda Superintendent John Gordon extended his sympathies to the Kriégel family and paid tribute to the dignity with which they conducted themselves during the trial.
"This is a difficult and complex case and we would like to acknowledge the support and help of the community at this time, without their help we wouldn't be in the place that we are today," he said.