[1] S. J. Bernau: The lateral completion of an arbitrary lattice group. J. Austral. Math. Soc. 19 (1975), 263–289. DOI 10.1017/S1446788700031463 | MR 0384640 | Zbl 0314.06011

[2] S. J. Bernau: Lateral and Dedekind completion of archimedean lattice groups. J. London Math. Soc. 12 (1976), 320–322. DOI 10.1112/jlms/s2-12.3.320 | MR 0401579 | Zbl 0333.06008

[3] G. Birkhoff: Lattice Theory. Revised edition, Amer Math. Soc. Colloq. Publ., vol. 25, Providence, 1948. MR 0029876 | Zbl 0033.10103

[4] D. Byrd and T. J. Lloyd: A note on lateral completion in lattice ordered groups. J.  London Math. Soc. 1 (1969), 358–362. DOI 10.1112/jlms/s2-1.1.358 | MR 0249339

[5] P. F. Conrad: Lateral completion of lattice ordered groups. Proc. London Math. Soc. 19 (1969), 444–480. MR 0244125

[6] J. Jakubík: Representations and extensions of $\ell $-groups. Czechoslovak Math. J. 13 (1963), 267–283. (Russian)

[7] J. Jakubík: Orthogonal hull of a strongly projectable lattice ordered group. Czechoslovak Math. J. 28 (1978), 484–504. MR 0505957

[8] J. Jakubík: Lateral and Dedekind completions of strongly projectable lattice ordered groups. Czechoslovak Math. J 47 (1997), 511–523. DOI 10.1023/A:1022419703077 | MR 1461430

[9] H. Nakano: Modern Spectral Theory. Tokyo, 1950. MR 0038564 | Zbl 0041.23402

[10] A. G. Pinsker: Extended semiordered groups and spaces. Uchen. Zap. Leningrad. Gos. Ped. Inst. 86 (1949), 236–365. (Russian)

[11] E. P. Shimbireva: To the theory of partially ordered groups. Mat. Sb. 20 (1947), 145–178. (Russian) MR 0020558