In theory only.

v.1 no.1 1975; v.1 no.2 1975; v.1 no.3 1975; v.1 no.4 1975; v.1 no.5 1975; v.1 no.6 1975; v.1 no.7 1975; v.1 no.8 1975; v.1 1975-76; v.1 no.9-10 1975-1976; v.1 no.11-12 1976; v.2 no.1-2 1976; v.2 no.3-4 1976; v.2 no.5 1976; v.2 no.6 1976; v.2 no.7 1976; v.2 no.8 1976; v.2 no.9 1976; v.2 no.10 1977; v.2 no.11-12 1977; v.3 no.1 1977; v.3 no.2 1977; v.3 no.3 1977; v.3 no.4 1977; v.3 no.5 1977; v.3 no.6 1977; v.3 no.7-11 1977-1978; v.3 no.12 1978; v.4 no.1 1978; v.4 no.2 1978; v.4 no.3 1978; v.4 no.4 1978; v.4 no.5 1978; v.4 no.6 1978; v.4 no.7 1979; v.4 no.8 1979; v.5 no.1 1979; v.5 no.2 1979; v.5 no.3 1979; 1981 abstracts; v.5 no.4 1981; v.5 no.5 1981; v.5 no.6-7 1981; v.5 no.8 1981; v.6 no.1; v.6 no.2; v.6 no.3; v.6 no.4; v.6 no.5; v.6 no.6; v.6 no.7; v.6 no.8; v.7 no.1; v.7 no.2; v.7 no.3; v.7 no.4; v.7 no.5; v.7 no.7; v.8 no.1; v.8 no.2; v.8 no.3; v.8 no.4; v.8 no.6; v.8 no.7; v.8 no.8; v.9 no.1; v.9 no.2; v.9 no.4; v.9 no.5; v.9 no.7; v.9 no.8; v.10 no.1; v.10 no.3; v.10 no.5; v.10 no.6; v.10 no.7; v.10 no.8; v.11 no.1; v.11 no.3; v.11 no.4; v.11 no.5; v.11 no.6; v.11 no.7; v.12 no.1; v.12 no.3; v.12 no.5; v.12 no.7; v.13 no.1