https://scholion.ai/paper/articles/10.1016%2F0048-7333(77)90009-9https://scholion.ai/paper/articles/10.1016%2F0048-7333(77)90007-5https://scholion.ai/paper/articles/10.1016%2F0048-7333(77)90008-7https://scholion.ai/paper/articles/10.1016%2F0048-7333(77)90003-8https://scholion.ai/paper/articles/10.1016%2F0048-7333(77)90001-4https://scholion.ai/paper/articles/10.1016%2F0048-7333(77)90005-1https://scholion.ai/paper/articles/10.1016%2F0048-7333(77)90002-6https://scholion.ai/paper/articles/10.1016%2F0048-7333(77)90010-5https://scholion.ai/paper/articles/10.1016%2F0048-7333(77)90004-x