1. Preventing unwanted pregnancies;Pearson, J.F.;BMJ,1991
2. Unplanned pregnancies;Dillner, L.;BMJ,1991
3. True story: the Liverpool project to reduce teenage pregnancy;Ashton, J.;Brtish Journal ofFamily Planning,1989
4. Unwanted pregnancies;Smith, T.,1990
5. Preventing unwanted pregnancies;Pearson, J.F.;BMJ,1991