Heterocycles.

v.1 (1973); v.2 (1974); v.3 (1975); v.4:1-6 (1976); v.4:7-12 (1976); v.4 no.1; v.4 no.2; v.5 (1976); v.6:1-6 (1977); v.6:7-12 (1977); v.6 no.1; v.6 no.2; v.7 no.1; v.7 no.2; v.8 (1977); v.9 no.1; v.9 no.2; v.9 no.3; v.12 no.1; v.12 no.2; v.14 no.1-4; v.14 no.5-8; v.14 no.9-12; v.15 no.1; v.15 no.2; v.16 no.1-6; v.16 no.7-12; v.17; v.18; v.19 no.1-6; v.19 no.7-12; v.20 no.1-3; v.20 no.4-6; v.20 no.7-9; v.20 no.10-12; v.21 no.1-2; v.22 no.1-3; v.22 no.4-6; v.22 no.7-9; v.22 no.10-12; v.23 no.1-4; v.23 no.5-8; v.23 no.9-12; v.24 no.1-3; v.24 no.4-6; v.24 no.9-12; v.57 no.4-5; v.63 no.10-11; v.68 no.11; v.68 no.12; v.69 no.1; v.73 no.1; v.74 no.1; v.75 no.4-5; v.75 no.6-7; v.75 no.8-9; v.75 no.10; v.78 no.5-6; v.78 no.7-8; v.78 no.9-10