CW Bock, P George, M Trachtman: A molecular orbital study of the rotation about the C-C bond in 1,3-butadiene. Theoretica Chimica Acta, 1984, 64. vsk, nro 4, s. 293–311. doi:10.1007/bf00551014. ISSN 0040-5744. Artikkelin verkkoversio.
CW Bock, P George, M Trachtman: A molecular orbital study of the rotation about the C-C bond in 1,3-butadiene. Theoretica Chimica Acta, 1984, 64. vsk, nro 4, s. 293–311. doi:10.1007/bf00551014. ISSN 0040-5744. Artikkelin verkkoversio.
CW Bock, P George, M Trachtman: A molecular orbital study of the rotation about the C-C bond in 1,3-butadiene. Theoretica Chimica Acta, 1984, 64. vsk, nro 4, s. 293–311. doi:10.1007/bf00551014. ISSN 0040-5744. Artikkelin verkkoversio.