The automorphism groups and endomorphism rings of torsion-free abelian groups of rank two
M. Król
GDML_Books, (1967), p.

CONTENTS§ 1. Introduction.......................................................................................................................................... 5§ 2. Definitions and lemmas................................................................................................................... 7§ 3. Theorem on the isomorphism of subdirect sums with the same kernels............................. 15§ 4. The group of automorphisms of a torsion-free abelian group of rank two............................. 53§ 5. The ring of endomorphisms of torsion-free abelian group of rank two................................... 63References.................................................................................................................................................. 73

EUDML-ID : urn:eudml:doc:268587
@book{bwmeta1.element.desklight-1ba998fe-e933-42c6-92c7-2a56016b2530,
     author = {M. Kr\'ol},
     title = {The automorphism groups and endomorphism rings of torsion-free abelian groups of rank two},
     series = {GDML\_Books},
     publisher = {Instytut Matematyczny Polskiej Akademi Nauk},
     address = {Warszawa},
     year = {1967},
     language = {en},
     url = {http://dml.mathdoc.fr/item/bwmeta1.element.desklight-1ba998fe-e933-42c6-92c7-2a56016b2530}
}
M. Król. The automorphism groups and endomorphism rings of torsion-free abelian groups of rank two. GDML_Books (1967),  http://gdmltest.u-ga.fr/item/bwmeta1.element.desklight-1ba998fe-e933-42c6-92c7-2a56016b2530/