@article{Pearlman1990,
author = {Pearlman, E.M.},
title= {Separation–individuation, self-concept, and object relations in fraternal twins, identical twins, and singletons},
year = {1990},
doi = {10.1080/00223980.1990.10543255},
volume = {124},
number = {6},
pages = {619--628},
}