Generalizations are considered of a well known bound state of a
particle on the real line generated by the single delta function
in the origin. The readers are reminded, firstly, that the delta
function is just a special case of a general point interaction
(or, if you wish, of a suitable matching or boundary condition),
and that the construction may be naturally extended to many
particles and/or particles with spin. Then, the message of the
(short) paper is formulated as a next step towards the models
where the Hamiltonian becomes pseudo-Hermitian (or, in a more
physical language, Hermitian with respect to some nonstandard, ad
hoc scalar product). The integrability of the new model is
emphasized and shown to follow from Yang Baxter equation for a
matching-condition matrix Y. A compact closed formula for bound
states is displayed.

MR2230216 Fei, Shao-Ming On integrability and pseudo-Hermitian
systems with spin-coupling point interactions. Czechoslovak J.
Phys. 55 (2005), no. 9, 1085--1090. 81Q10 (81R12)