@article{ljs16021,
 author={Mohammed Yahaya, U. a. Y. A.},
 year={2010},
 title={Fully Implicit Four Point Block Backward Difference Formulae for Solving First Order Initial Value Problems},
 journal={Leonardo J. Sci.},
 volume={9},
 number={16},
 pages={21-30},
 url={http://ljs.academicdirect.org/A16/021_030.pdf}
}