N. Kehayopulu, S. Lajos, G. Lepouras
PU.M.A. Vol. 8 (1997), No. 1, pp 75-81.

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Niovi Kehayopulu, George Lepouras and Michael Tsingelis
Math. Japonica 46, No. 2 (1997), 311-315. Îœathematical Reviews: 06019 (Alexey Vernitskii). Zentralblatt fur Math 890.06009 (H. Mitsch).

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Note: This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.

Niovi Kehayopulu and George Lepouras
Math. Japonica Vol. 47, No. 2 (1998), 281-285. Îœathematical Reviews: 99d: 06020 (Mark Verus Lawson).

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Note: This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.

Kehayopulu, N. and G. Lepouras
Sovremennaja Algebra 5 (25) (2000), 47-62 (in Russian).

Abstract:

Note: This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.