sentence1: it might be important to refer to some recent investigations which argue that if the spin connection is also considered along with the pure-tetrad formalism for the teleparallel gravity the local invariance problem might be resolved .
sentence2: perhaps it might be interesting to refer where the authors argue that instead of the pure-tetrad formalism for the f -gravity , if in addition , the spin connection is allowed , then the problem with local lorentz invariance might be resolved .