Stancliffe and Sarjeant, 1994
From dinoflaj3
Stancliffe, R.P.W. and Sarjeant, W.A.S., 1994: The acritarch genus Veryhachium Deunff 1954, emend. Sarjeant and Stancliffe 1994: a taxonomic restudy and a reassessment of its constituent species. Micropaleontology, v.40, no.3, p.223-241.