Letters in Mathematical Physics
Letters in Mathematical Physics > 1997 > 42 > 3 > 271-279
Letters in Mathematical Physics > 1997 > 42 > 3 > 195-204
Letters in Mathematical Physics > 1997 > 42 > 3 > 241-259
Letters in Mathematical Physics > 1997 > 42 > 3 > 215-227
Letters in Mathematical Physics > 1997 > 42 > 3 > 229-239
Letters in Mathematical Physics > 1997 > 42 > 3 > 205-214
Letters in Mathematical Physics > 1997 > 42 > 3 > 261-270
Letters in Mathematical Physics > 1997 > 42 > 3 > 281-295