The phrase "a believed to" is not correct in written English.
It seems to be an incomplete expression and lacks clarity.
Example: "He is a believed to be expert in his field."
Alternatives: "considered to be" or "thought to be".
Hughes and his co-workers also saw plenty of silicon-rich blobs in Cas A, believed to arise from the explosive burning of oxygen atoms into silicon further out from the core at temperatures of perhaps 3 billion degrees.
This conclusion was based on stopped-flow spectrophotometric observation of a transient, A, believed to be an iron II) nitrosyl adduct, which was formed at a rate five-fold faster than that predicted for formation of.OH.
But in certain parts of China, aquatic cocaine (also known as fish maw) is a believed to have medicinal value.
Notes hidden under desks, stolen kisses, belly laughs, song dedications and seemingly never-ending embraces for a believed to be never-ending love.
Self-renewing stem cells and progenitor cells a believed to comprise a neurosphere [33].
For example, higher serum concentrations of VEGF-C than that of VEGF-A, believed to be tumour derived, correlates with lymph node metastasis in patients with squamous cell carcinoma of the oesophagus (Krzystek-Korpacka et al, 2007).
Vascular Endothelial Growth Factor-A (VEGF-A) is believed to be a critical angiogenic mitogen [ 9].
One was made for throwing a missile, believed to be a coin, on to the pitch.
"Upon arrival, they found the body of a migrant, believed to be a minor from Africa.
A wire believed to be a detonator cord dangled in front of his chest.
The living and dining area has a fireplace and a door believed to be original.
