BLSM - What does BLSM stand for? The Free Dictionary
References in periodicals archive
The figure also displays that BLSM
and OLSM propagate the largest and the smallest error respectively and ULSM is a method in the middle of these two methods.
Finally note that if the BLSM is 'true', then we can still estimate (14), but it becomes a rather meaningless hybrid with no structural interpretation.
However, what evidence there is tends to support the FLRE model rather than the backward-looking BLSM alternative.