The phrase "a series of stringent" is correct and usable in written English.
It can be used when describing a set of strict or severe measures, rules, or conditions.
Example: "The company implemented a series of stringent safety protocols to ensure the well-being of its employees."
Alternatives: "a set of strict" or "a number of rigorous".
Hillary Rodham Clinton endorsed a series of stringent gun-control measures yesterday, calling for the licensing of all new gun owners and the registration of new guns.
Monday's amputations — the latest in a series of stringent punishments carried out by the Islamists, including a stoning, whippings and amputations — drew swift condemnation from local officials.
Whoever ultimately takes over from Lancaster, therefore, should make a series of stringent demands to avoid being constrained by the white and red tape that has entangled all his predecessors.
The striker has accepted a basic £80,000-a-week deal from Liverpool, half what he earns in Italy, with top-ups dependent on a series of stringent behaviour-and-performance clauses worth up to £2m a year.
Prospective teachers undergo a series of stringent selection processes including interviews and tests by the Ministry of Education MOEE) before they are selected.
The Speedmaster had to pass a series of stringent tests before it was approved by Nasa, including temperature fluctuations between -160° and +120°C.
GeneChips were washed with a series of non-stringent (25°C) and stringent (50°C) solutions containing variable amounts of MES, Tween20 and SSPE.
GeneChips were washed with a series of non-stringent (25°C) and stringent (50°C) solutions containing variable amounts of MES buffer, tween 20 and SSPE buffer.
GeneChips were washed with a series of non-stringent (25°C) and stringent (50°C) solutions containing variable amounts of 2-morpholinoethanesulfonic acid, Tween 20, and SSPE (3 M NaCl, 0.2 M, NaH2PO4, 0.02 M EDTA).
Quantick began the year with a series of imposingly stringent reappraisals of Eighties indie icons in The Word, the most acerbic of which (a full frontal assault on Morrissey's greatest hits) attracted the twin accolades of praise from this column and a lawsuit from the ex-Smiths singer's industrious legal team.
HMM searches were run using a series of increasingly stringent threshold E-values, from E-value ≤1 to E-value ≤0.1 (data not shown).
