Helen Bergen

Combinatorial Optimization and the Knapsack Cipher

Ed Dawson, Andrew J. Clark, Helen Bergen, 1996, Cryptologia.

Message collision in block ciphers with message authentication

Ed Dawson, Helen Bergen, Caroline Allinson, 1993, Comput. Secur..

File Security in Wordperfect 5.0

Helen Bergen, W. J. Caelli, 1991, Cryptologia.

Development and evaluation of a training program in peer support for former consumers.

Helen Bergen, Robert Thornton, Tom Meehan, 2002, International journal of mental health nursing.

Effect of withdrawal of co-proxamol on prescribing and deaths from drug poisoning in England and Wales: time series analysis

Helen Bergen, Navneet Kapur, Clare Griffiths, 2009, BMJ : British Medical Journal.

Long term effect of reduced pack sizes of paracetamol on poisoning deaths and liver transplant activity in England and Wales: interrupted time series analyses

Helen Bergen, Navneet Kapur, David Gunnell, 2013, BMJ : British Medical Journal.

The effect of using NHS number as the unique identifier for patients who self-harm: a multi-centre descriptive study

Helen Bergen, Jayne Cooper, Navneet Kapur, 2007, Clinical practice and epidemiology in mental health : CP & EMH.