1. Fetal monitoring: Is it worth it?;Quilligan;Obstet. Gynecol,1975
2. Problems and significance of electronic monitoring of fetal heart rate;Kubli;Geburtsh. Frauenheilkd,1974
3. Die Pränatale fetale Elektrokardiographie;Bolte;Gynäkologe,1969
4. The fetal magnetocardiogram;Kariniemi;J. Perinat. Med,1974
5. The magnetocardiogram in cardiac disorders;Saarinen;Cardiovasc. Res,1974