R. Ketelaar

Dragonflies of Dragon’s Blood Island: Atlas of the Odonata of the Socotra Archipelago (Yemen)

M. Morris, P. Vahalík, H. Dumont, 2020, Rendiconti Lincei. Scienze Fisiche e Naturali.

Critical species of Odonata in Europe

A. C. Rivera, G. Sahlén, R. Bernard, 2004 .

Ruminal behaviour of structural carbohydrates, non-structural carbohydrates and crude protein from concentrate ingredients in dairy cows.

C. Koelen, A. M. Vuuren, S. Tamminga, 1990 .

HEPATOMAS AND ORAL CONTRACEPTIVES

E. Rose, R. Ketelaar, J. Berg, 1974 .

In sacco degradation of organic matter and crude protein of fresh grass (Lolium perenne) in the rumen of grazing dairy cows

A. M. Vuuren, S. Tamminga, R. Ketelaar, 1991, The Journal of Agricultural Science.

Ruminal availability of nitrogen and carbohydrates from fresh and preserved herbage in dairy cows.

A. M. Vuuren, S. Tamminga, R. Ketelaar, 1990 .

Degradation of nitrogenous compounds in conserved forages in the rumen of dairy cows.

A. M. Vuuren, S. Tamminga, R. Ketelaar, 1991 .

Nutritive value of some commonly available ruminant feeds in Sri Lanka.

S. Tamminga, J. M. Meer, G. Zemmelink, 1987 .