1. Methods of chorionic villus sampling;Brambati,1986
2. Chorionic villi sampling using rigid forceps under ultrasound control;Dumez,1985
3. Direct vision technique for chorionic villi sampling in 100 diagnostic cases;Gustavii,1985
4. Transabdominal chorionic villi sampling for first trimester fetal diagnosis;Smidt,1985
5. Chorion villus sampling newsletter;Jackson,1986