@article{1250130383,
author = {Arnold, D. and Vinsonhaler, C.I. and Wickless, W.J.},
title = {Quasi-pure projective and injective torsion free abelian groups of rank 2},
journal = {Rocky Mountain J. Math.},
volume = {6},
number = {4},
year = {1976},
pages = { 61-70},
language = {en},
url = {http://dml.mathdoc.fr/item/1250130383}
}
Arnold, D.; Vinsonhaler, C.I.; Wickless, W.J. Quasi-pure projective and injective torsion free abelian groups of rank 2. Rocky Mountain J. Math., Tome 6 (1976) no. 4, pp. 61-70. http://gdmltest.u-ga.fr/item/1250130383/