Modern physics letters A.

v.3 no.8-13; v.4 no.1-9; v.4 no.10-18; v.5 no.11-20; v.5 no.21-26; v.6 no.1-11; v.6 no.12-22; v.6 no.23-31; v.7 no.11-20; v.7 no.21-25; v.7 no.26-30; v.9 no.7-11; v.9 no.17-20; v.10 no.17-21; v.10 no.22-26; v.10 no.27-31; v.10 no.32-36; v.11 no.26-30; v.12 no.11-16; v.12 no.17-21; v.12 no.22-26; v.12 no.27-31; v.13 no.7-10; v.14 no.17-20; v.14 no.21-23; v.14 no.24-28; v.15 no.6-12; v.15 no.13-16; v.15 no.17-20; v.15 no.27-30; v.15 no.31-34; v.15 no.35-40; v.16 no.19-23; v.16 no.24-30; v.17 no.1-5; v.17 no.6-10; v.17 no.11-17; v.17 no.18-21; v.17 no.22-25; v.17 no.26-30; v.17 no.31-35; v.17 no.36-40; v.18 no.11-15; v.18 no.16-20; v.18 no.21-25; v.18 no.26-30; v.18 no.31-35; v.20 no.26; v.20 no.27-31; v.20 no.32-36; v.21 no.17-20; v.22 no.14-20; v.22 no.25-32; v.22 no.33-40; v.23 no.7-10; v.23 no.11-13; v.23 no.14-20; v.23 no.21-26; v.23 no.31-33; v.23 no.34-40; v.24 no.7-10; v.24 no.11-13; v.24 no.14-16; v.24 no.17-19; v.24 no.21-26; v.24 no.27-30; v.24 no.31-34; v.5 no. 27-32 Index; 3 no. 14-18 Index v.1-3