Model completeness and direct power

Kazem Taghva. Model completeness and direct power. Math. Log. Q., 36(1):3-9, 1990. [doi]

@article{Taghva90,
  title = {Model completeness and direct power},
  author = {Kazem Taghva},
  year = {1990},
  doi = {10.1002/malq.19900360102},
  url = {http://dx.doi.org/10.1002/malq.19900360102},
  researchr = {https://researchr.org/publication/Taghva90},
  cites = {0},
  citedby = {0},
  journal = {Math. Log. Q.},
  volume = {36},
  number = {1},
  pages = {3-9},
}