Evans, W. D.; Lewis, R.; Saitó, Y.: Finiteness of bound states of general $n$-body operators.
(English).
In:
Kurzweil, Jaroslav (ed.): Equadiff 7.
Proceedings of the 7th Czechoslovak Conference on Differential Equations and Their Applications held in Prague, 1989.
BSB B.G. Teubner Verlagsgesellschaft, Leipzig, 1990.
pp. 159-162
