The Fertility Pattern of Twins and the General Population Compared: Evidence from Danish Cohorts 1945-64

Hans-Peter Kohler, Lisbeth B. Knudsen, Axel Skytthe, Kaare Christensen
2002 Demographic Research  
doi:10.4054/demres.2002.6.14 fatcat:mvpekgziybf6lguqg32whgzjhi