1. (a) & ?The Conservation of Orbital Symmetry?, Verlag Chemie, Weinheim 1970: p. 31;
2. (b) & ?The Conservation of Orbital Symmetry?, Verlag Chemie, Weinheim 1970: p. 45;
3. (c) & ?The Conservation of Orbital Symmetry?, Verlag Chemie, Weinheim 1970: p. 79;
4. (d) & ?The Conservation of Orbital Symmetry?, Verlag Chemie, Weinheim 1970: p. 73ff.;
5. (e) & ?The Conservation of Orbital Symmetry?, Verlag Chemie, Weinheim 1970: p. 14ff.