In order to continue to receive payments under a fellowship, a fellow shall--
(a) Maintain satisfactory progress in the program for which the fellowship was awarded as determined by the institution of higher education;
(b) Devote essentially full time to study or research in the field in which the fellowship was awarded, as determined by the institution of higher education;
(c) Not engage in gainful employment during the period of the fellowship except on a part-time basis, for the institution of higher education at which the fellowship was awarded, in teaching, research, or similar activities approved by the Secretary; and
(d) Begin study under the fellowship in the academic year specified in the fellowship award. (Authority: 20 U.S.C. 1134-1134d)