"several commonly used" is a correct phrase that is commonly used in formal written English.
For example, "Several commonly used methods exist for solving this problem."
Several commonly used natural or synthetic derivatives of morphine are used in drug therapeutics.
Mr. Ashcroft supports a constitutional amendment that would outlaw abortion even in cases of incest and rape and that would criminalize several commonly used forms of contraception.
Several commonly used methods for smoothing were tested as follows.
Virtual screening results are assessed by several commonly used evaluation metrics.
The Epigenomics (Genome) workflow is used for automating several commonly used operations in genome sequence processing.
We will demonstrate the effectiveness of the proposed model using several commonly used examples.
We also provide design guidelines to obtain resolvable paths for several commonly used system configurations.
Several commonly used electron transfer reagents were compared in their reactivity towards three epoxides.
Several commonly used extraction methods were compared based on absolute recoveries and reproducibilities.
So far several commonly used methods are available to assign charges.
Several commonly used fan sizes and blockage distances are investigated in this study.
